<s>
Windows	B-Application
Search	I-Application
(	O
also	O
known	O
as	O
Instant	O
Search	O
)	O
is	O
a	O
content	B-Application
index	I-Application
desktop	B-Application
search	I-Application
platform	O
by	O
Microsoft	O
introduced	O
in	O
Windows	B-Application
Vista	I-Application
as	O
a	O
replacement	O
for	O
both	O
the	O
previous	O
Indexing	B-Library
Service	I-Library
of	O
Windows	B-Application
2000	I-Application
and	O
the	O
optional	O
MSN	B-Application
Desktop	I-Application
Search	I-Application
for	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
,	O
designed	O
to	O
facilitate	O
local	O
and	O
remote	O
queries	O
for	O
files	O
and	O
non-file	O
items	O
in	O
compatible	O
applications	O
including	O
Windows	B-Protocol
Explorer	I-Protocol
.	O
</s>
<s>
It	O
was	O
developed	O
after	O
the	O
postponement	O
of	O
WinFS	B-Application
and	O
introduced	O
to	O
Windows	O
constituents	O
originally	O
touted	O
as	O
benefits	O
of	O
that	O
platform	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
creates	O
a	O
locally	O
managed	B-Application
Index	O
of	O
files	O
—	O
documents	O
,	O
emails	O
,	O
folders	O
,	O
programs	O
,	O
photos	O
,	O
tracks	O
,	O
and	O
videos	O
—	O
and	O
file	O
contents	O
,	O
as	O
well	O
as	O
of	O
non-file	O
items	O
including	O
those	O
of	O
Microsoft	B-Application
Outlook	I-Application
for	O
which	O
users	O
can	O
perform	O
incremental	B-Application
searches	I-Application
based	O
on	O
details	O
such	O
as	O
authors	O
,	O
contents	O
,	O
dates	O
,	O
file	O
names	O
,	O
file	O
types	O
,	O
people	O
,	O
and	O
sizes	O
;	O
the	O
Index	O
stores	O
actual	O
prose	O
from	O
inside	O
documents	O
and	O
metadata	O
properties	O
from	O
other	O
content	O
.	O
</s>
<s>
Control	O
Panel	O
and	O
Settings	B-Application
can	O
also	O
be	O
searched	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
was	O
introduced	O
in	O
Windows	B-Application
Vista	I-Application
as	O
a	O
replacement	O
for	O
the	O
previous	O
Indexing	B-Library
Service	I-Library
to	O
facilitate	O
data	O
discovery	O
and	O
management	O
,	O
promote	O
greater	O
rapidity	O
of	O
search	O
results	O
,	O
and	O
to	O
unify	O
desktop	B-Application
search	I-Application
platforms	O
across	O
Microsoft	B-Application
Windows	I-Application
;	O
it	O
was	O
also	O
available	O
as	O
an	O
optional	O
download	O
for	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
There	O
have	O
been	O
several	O
updates	O
to	O
its	O
functionality	O
since	O
its	O
introduction	O
,	O
and	O
it	O
is	O
also	O
included	O
in	O
Windows	B-Device
7	I-Device
,	O
Windows	B-Application
8	I-Application
,	O
Windows	B-Device
8.1	I-Device
,	O
Windows	B-Operating_System
10	I-Operating_System
,	O
and	O
Windows	B-Application
11	I-Application
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
is	O
the	O
successor	O
of	O
the	O
Indexing	B-Library
Service	I-Library
,	O
a	O
remnant	O
of	O
the	O
Object	B-Application
File	I-Application
System	I-Application
feature	O
of	O
the	O
Cairo	B-Application
project	I-Application
which	O
never	O
materialized	O
.	O
</s>
<s>
Microsoft	O
began	O
development	O
of	O
Windows	B-Application
Search	I-Application
after	O
the	O
postponement	O
of	O
WinFS	B-Application
;	O
it	O
introduces	O
features	O
originally	O
touted	O
as	O
benefits	O
of	O
that	O
platform	O
,	O
such	O
as	O
content	O
indexing	O
,	O
incremental	O
searching	O
,	O
and	O
property	O
stacking	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
creates	O
a	O
locally	O
stored	O
index	O
of	O
files	O
and	O
non-file	O
items	O
stored	O
on	O
a	O
computer	O
.	O
</s>
<s>
Once	O
a	O
file	O
's	O
contents	O
have	O
been	O
added	O
to	O
this	O
index	O
,	O
Windows	B-Application
Search	I-Application
is	O
able	O
to	O
use	O
the	O
index	O
to	O
search	O
results	O
more	O
rapidly	O
than	O
it	O
would	O
take	O
to	O
search	O
through	O
all	O
the	O
files	O
on	O
the	O
computer	O
.	O
</s>
<s>
Searches	O
are	O
performed	O
not	O
only	O
on	O
file	O
names	O
,	O
but	O
also	O
on	O
the	O
contents	O
of	O
the	O
file	O
(	O
provided	O
a	O
proper	O
handler	O
for	O
the	O
file	O
type	O
is	O
installed	O
such	O
as	O
a	O
PDF	O
reader	O
)	O
as	O
well	O
as	O
the	O
keywords	O
,	O
comments	O
and	O
all	O
other	O
forms	O
of	O
metadata	O
that	O
Windows	B-Application
Search	I-Application
recognizes	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
features	O
incremental	B-Application
search	I-Application
(	O
also	O
known	O
as	O
"	O
search	B-Application
as	I-Application
you	I-Application
type	I-Application
"	O
)	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
supports	O
IFilters	B-Library
,	O
components	O
that	O
enable	O
search	O
programs	O
to	O
scan	O
files	O
for	O
their	O
contents	O
and	O
metadata	O
.	O
</s>
<s>
Once	O
an	O
appropriate	O
IFilter	B-Library
has	O
been	O
installed	O
for	O
a	O
particular	O
file	O
format	O
,	O
the	O
IFilter	B-Library
is	O
used	O
to	O
extract	O
the	O
text	O
from	O
files	O
which	O
were	O
saved	O
in	O
that	O
format	O
.	O
</s>
<s>
By	O
default	O
,	O
Windows	B-Application
Search	I-Application
includes	O
IFilters	B-Library
for	O
common	O
filetypes	O
,	O
including	O
Word	B-Application
documents	I-Application
,	O
Excel	O
spreadsheets	O
,	O
PowerPoint	O
presentations	O
,	O
HTML	B-Language
files	I-Language
,	O
text	B-General_Concept
files	I-General_Concept
,	O
MP3	B-Application
and	O
WMA	B-Application
music	O
files	O
,	O
WMV	B-Device
,	O
ASF	B-Application
and	O
AVI	O
video	O
files	O
and	O
JPEG	O
,	O
BMP	B-Device
and	O
PNG	O
images	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
uses	O
property	O
handlers	O
to	O
handle	O
metadata	O
from	O
file	O
formats	O
.	O
</s>
<s>
A	O
property	O
handler	O
needs	O
a	O
property	O
description	O
and	O
a	O
schema	O
for	O
the	O
property	O
for	O
Windows	B-Application
Search	I-Application
to	O
index	O
the	O
metadata	O
.	O
</s>
<s>
For	O
example	O
,	O
files	O
are	O
accessed	O
using	O
File	O
System	O
Protocol	O
Handler	O
,	O
Microsoft	B-Application
Office	I-Application
Outlook	I-Application
data	O
stores	O
using	O
the	O
Outlook	O
Protocol	O
Handler	O
and	O
Internet	B-Application
Explorer	I-Application
cache	O
using	O
the	O
IE	O
History/Cache	O
Protocol	O
Handler	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
is	O
implemented	O
as	O
a	O
Windows	O
Service	O
.	O
</s>
<s>
The	O
search	O
service	O
implements	O
the	O
Windows	B-Application
Search	I-Application
configuration	O
and	O
query	O
APIs	B-Application
and	O
also	O
controls	O
,	O
as	O
well	O
as	O
all	O
indexing	O
and	O
query	O
components	O
.	O
</s>
<s>
The	O
most	O
important	O
component	O
of	O
Windows	B-Application
Search	I-Application
is	O
the	O
Indexer	O
,	O
which	O
crawls	O
the	O
file	O
system	O
on	O
initial	O
setup	O
,	O
and	O
then	O
listens	O
for	O
file	O
system	O
notifications	O
to	O
pick	O
up	O
changed	O
files	O
in	O
order	O
to	O
create	O
and	O
maintain	O
the	O
index	O
of	O
data	O
.	O
</s>
<s>
SearchIndexer.exe	B-Application
,	O
which	O
hosts	O
the	O
indexes	O
and	O
the	O
list	O
of	O
URIs	B-Protocol
that	O
require	O
indexing	O
,	O
as	O
well	O
as	O
exposes	O
the	O
external	O
configuration	O
and	O
query	O
APIs	B-Application
that	O
other	O
applications	O
use	O
to	O
leverage	O
the	O
Windows	B-Application
Search	I-Application
features	O
.	O
</s>
<s>
SearchProtocolHost.exe	B-Application
,	O
which	O
hosts	O
the	O
protocol	O
handlers	O
.	O
</s>
<s>
SearchFilterHost.exe	B-Application
,	O
which	O
hosts	O
the	O
IFilters	B-Library
and	O
property	O
handlers	O
to	O
extract	O
metadata	O
and	O
textual	O
content	O
.	O
</s>
<s>
It	O
is	O
a	O
low	O
integrity	O
process	O
,	O
which	O
means	O
that	O
it	O
does	O
not	O
have	O
any	O
permission	O
to	O
change	O
the	O
system	O
settings	B-Application
,	O
so	O
even	O
if	O
it	O
encounters	O
files	O
with	O
malicious	O
content	O
,	O
and	O
by	O
any	O
chance	O
if	O
they	O
manage	O
to	O
take	O
over	O
the	O
process	O
,	O
they	O
will	O
not	O
be	O
able	O
to	O
change	O
any	O
system	O
settings	B-Application
.	O
</s>
<s>
The	O
Gatherer	O
retrieves	O
the	O
list	O
of	O
URIs	B-Protocol
that	O
need	O
to	O
be	O
crawled	O
and	O
invokes	O
proper	O
protocol	O
handler	O
to	O
access	O
the	O
store	O
that	O
hosts	O
the	O
URI	B-Protocol
,	O
and	O
then	O
the	O
proper	O
property-handler	O
(	O
to	O
extract	O
metadata	O
)	O
and	O
IFilter	B-Library
to	O
extract	O
the	O
document	O
text	O
.	O
</s>
<s>
The	O
metadata	O
is	O
stored	O
in	O
property	O
store	O
,	O
which	O
is	O
a	O
database	O
maintained	O
by	O
the	O
ESE	B-Application
database	O
engine	O
.	O
</s>
<s>
The	O
text	O
is	O
tokenized	O
and	O
the	O
tokens	O
are	O
stored	O
in	O
a	O
custom	O
database	O
built	O
using	O
Inverted	B-Algorithm
Indices	I-Algorithm
.	O
</s>
<s>
The	O
Gather	O
Queue	O
maintains	O
a	O
prioritized	O
queue	O
of	O
URIs	B-Protocol
that	O
needs	O
indexing	O
.	O
</s>
<s>
Throttled	O
:	O
In	O
this	O
state	O
,	O
the	O
crawling	O
of	O
URIs	B-Protocol
and	O
extraction	O
of	O
text	O
and	O
metadata	O
is	O
deliberately	O
throttled	O
,	O
so	O
that	O
the	O
number	O
of	O
operations	O
per	O
minute	O
is	O
kept	O
under	O
tight	O
control	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
queries	O
are	O
specified	O
in	O
Advanced	O
Query	O
Syntax	O
(	O
AQS	O
)	O
which	O
supports	O
not	O
only	O
simple	O
text	O
searches	O
but	O
provides	O
advanced	O
property-based	O
query	O
operations	O
as	O
well	O
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
also	O
supports	O
wildcard	B-Algorithm
prefix	O
matching	O
searches	O
.	O
</s>
<s>
It	O
also	O
includes	O
several	O
SQL-like	O
operators	O
like	O
GROUP	O
BY	O
.	O
</s>
<s>
AQS	O
is	O
locale	O
dependent	O
and	O
uses	O
different	O
keywords	O
in	O
international	O
versions	O
of	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
Users	O
can	O
access	O
the	O
Windows	B-Application
Search	I-Application
index	O
programmatically	O
using	O
managed	B-Application
as	O
well	O
as	O
native	B-Library
code	O
.	O
</s>
<s>
Native	B-Library
code	O
connects	O
to	O
the	O
index	O
catalog	O
by	O
using	O
a	O
Data	O
Source	O
Object	O
retrieved	O
from	O
the	O
Indexing	B-Library
Service	I-Library
OLE	B-Language
DB	I-Language
provider	I-Language
.	O
</s>
<s>
Managed	B-Application
code	O
use	O
the	O
MSIDXS	O
ADO.NET	B-Device
provider	I-Device
.	O
</s>
<s>
Programmers	O
specify	O
the	O
criteria	O
for	O
searches	O
using	O
SQL-like	O
syntax	O
.	O
</s>
<s>
The	O
SQL	B-Language
query	O
can	O
either	O
be	O
created	O
by	O
hand	O
,	O
or	O
by	O
using	O
an	O
implementation	O
of	O
the	O
ISearchQueryHelper	O
interface	B-Application
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
provides	O
implementations	O
of	O
the	O
interface	B-Application
to	O
convert	O
an	O
AQS	O
or	O
NQS	O
queries	O
to	O
their	O
SQL	B-Language
counterpart	O
.	O
</s>
<s>
The	O
OLE	O
DB/SQL	O
API	B-Application
implements	O
the	O
functionality	O
for	O
searching	O
and	O
querying	O
across	O
the	O
indices	O
and	O
property	O
stores	O
.	O
</s>
<s>
It	O
uses	O
a	O
variant	O
of	O
SQL	B-Language
in	O
which	O
to	O
represent	O
the	O
query	O
(	O
regular	O
SQL	B-Language
with	O
certain	O
restrictions	O
)	O
and	O
returns	O
results	O
as	O
OLE	B-Language
DB	I-Language
Rowsets	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
stores	O
its	O
index	O
in	O
an	O
Extensible	B-Application
Storage	I-Application
Engine	I-Application
file	O
named	O
Windows.edb	O
that	O
exists	O
,	O
by	O
default	O
,	O
in	O
the	O
\ProgramData\Microsoft\Search\Data\Applications\Windows\	O
folder	O
at	O
the	O
root	O
of	O
the	O
system	O
drive	O
in	O
Windows	B-Application
Vista	I-Application
or	O
in	O
later	O
versions	O
of	O
Windows	O
.	O
</s>
<s>
(	O
The	O
corresponding	O
location	O
in	O
Windows	B-Application
XP	I-Application
is	O
\All	O
Users	O
\Application	O
Data	O
\Microsoft\Search\Data\Applications\Windows\	O
inside	O
the	O
Documents	O
and	O
Settings	B-Application
folder	O
.	O
)	O
</s>
<s>
A	O
SQL	B-Language
query	O
can	O
directly	O
reference	O
these	O
tables	O
and	O
index	O
catalogues	O
and	O
use	O
the	O
MSIDXS	O
provider	O
to	O
run	O
queries	O
against	O
them	O
.	O
</s>
<s>
The	O
search	B-Application
index	I-Application
can	O
also	O
be	O
used	O
via	O
OLE	B-Language
DB	I-Language
,	O
using	O
the	O
CollatorDSO	O
provider	O
.	O
</s>
<s>
However	O
,	O
the	O
OLE	B-Language
DB	I-Language
provider	I-Language
is	O
read-only	O
,	O
supporting	O
only	O
SELECT	O
and	O
GROUP	O
ON	O
SQL	B-Language
statements	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
also	O
registers	O
a	O
search-ms	O
application	O
protocol	O
,	O
which	O
can	O
be	O
used	O
to	O
represent	O
searches	O
as	O
URIs	B-Protocol
.	O
</s>
<s>
The	O
search	O
parameters	O
and	O
filters	O
are	O
encoded	O
in	O
the	O
URI	B-Protocol
using	O
AQS	O
or	O
its	O
natural	O
language	O
counterpart	O
,	O
NQS	O
.	O
</s>
<s>
When	O
invokes	O
the	O
URI	B-Protocol
,	O
Windows	B-Application
Search	I-Application
(	O
which	O
is	O
the	O
default	O
registered	O
handler	O
for	O
the	O
protocol	O
)	O
launches	O
the	O
Search	O
Explorer	O
with	O
the	O
results	O
of	O
the	O
search	O
.	O
</s>
<s>
In	O
Windows	B-Application
Vista	I-Application
SP1	O
or	O
later	O
,	O
third-party	O
handlers	O
can	O
also	O
register	O
themselves	O
as	O
the	O
application	O
protocol	O
handler	O
,	O
so	O
that	O
searches	O
can	O
be	O
performed	O
using	O
any	O
search	O
engine	O
which	O
the	O
user	O
has	O
set	O
as	O
default	O
,	O
and	O
not	O
just	O
Windows	B-Application
Search	I-Application
.	O
</s>
<s>
The	O
Windows	B-Application
Search	I-Application
service	O
provides	O
the	O
Notifications	O
API	B-Application
component	O
to	O
allow	O
applications	O
to	O
"	O
push	O
"	O
changed	O
items	O
that	O
need	O
indexing	O
to	O
the	O
Windows	B-Application
Search	I-Application
indexer	O
.	O
</s>
<s>
Applications	O
use	O
the	O
component	O
to	O
supply	O
the	O
URIs	B-Protocol
of	O
the	O
items	O
that	O
need	O
to	O
be	O
indexed	O
,	O
and	O
the	O
URIs	B-Protocol
are	O
written	O
to	O
the	O
Gather	O
Queue	O
,	O
where	O
they	O
are	O
read	O
off	O
by	O
the	O
indexer	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
and	O
Microsoft	B-Application
OneNote	I-Application
use	O
this	O
ability	O
to	O
index	O
the	O
items	O
managed	B-Application
by	O
them	O
and	O
use	O
Windows	B-Application
Search	I-Application
queries	O
to	O
provide	O
the	O
in-application	O
searching	O
features	O
.	O
</s>
<s>
The	O
internal	O
USN	B-Application
Journal	I-Application
Notifier	O
component	O
of	O
Windows	B-Application
Search	I-Application
also	O
uses	O
the	O
Notifications	O
API	B-Application
,	O
monitoring	O
the	O
Change	B-Application
Journal	I-Application
in	O
an	O
NTFS	B-Application
volume	O
to	O
keep	O
track	O
of	O
files	O
that	O
have	O
changed	O
on	O
the	O
volume	O
.	O
</s>
<s>
If	O
the	O
file	O
is	O
in	O
a	O
location	O
indexed	O
by	O
Windows	B-Application
Search	I-Application
and	O
does	O
not	O
have	O
the	O
FANCI	O
(	O
File	O
Attribute	O
Not	O
Content	O
Indexed	O
)	O
attribute	O
set	O
,	O
the	O
Windows	B-Application
Search	I-Application
service	O
is	O
notified	O
of	O
its	O
path	O
via	O
the	O
Notification	O
API	B-Application
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
Configuration	O
APIs	B-Application
are	O
used	O
to	O
specify	O
the	O
configuration	O
settings	B-Application
,	O
such	O
as	O
the	O
root	O
of	O
the	O
URIs	B-Protocol
that	O
needs	O
to	O
be	O
monitored	O
,	O
setting	O
the	O
frequency	O
of	O
crawling	O
or	O
viewing	O
status	O
information	O
like	O
number	O
of	O
items	O
indexed	O
or	O
length	O
of	O
the	O
gather	O
queue	O
or	O
the	O
reason	O
for	O
throttling	O
the	O
indexer	O
.	O
</s>
<s>
It	O
also	O
exposes	O
APIs	B-Application
to	O
register	O
protocol	O
handlers	O
(	O
via	O
the	O
ISearchProtocol( )	O
interface	B-Application
,	O
property	O
handlers	O
(	O
via	O
the	O
IPropertyStore( )	O
interface	B-Application
)	O
or	O
IFilter	B-Library
implementations	O
(	O
via	O
the	O
IFilter( )	O
interface	B-Application
)	O
.	O
</s>
<s>
IFilter	B-Library
implementations	O
allow	O
only	O
read-only	O
extraction	O
of	O
text	O
and	O
properties	O
,	O
whereas	O
IPropertyStore	O
allows	O
writing	O
properties	O
as	O
well	O
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
,	O
a	O
standalone	O
add-on	O
made	O
available	O
as	O
freeware	B-License
,	O
is	O
the	O
implementation	O
of	O
Windows	B-Application
Search	I-Application
for	O
Windows	B-Application
2000	I-Application
,	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
and	O
Windows	B-Application
Search	I-Application
share	O
a	O
common	O
architecture	O
and	O
indexing	O
technology	O
and	O
use	O
a	O
compatible	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
.	O
</s>
<s>
Searches	O
are	O
specified	O
using	O
the	O
Advanced	O
Query	O
Syntax	O
and	O
are	O
executed	O
while	O
the	O
user	O
types	O
(	O
incremental	B-Application
find	I-Application
)	O
.	O
</s>
<s>
By	O
default	O
,	O
it	O
comes	O
with	O
a	O
number	O
of	O
IFilters	B-Library
for	O
the	O
most	O
common	O
file	O
types	O
—	O
documents	O
,	O
audio	O
,	O
video	O
as	O
well	O
as	O
protocol	O
handlers	O
for	O
Microsoft	B-Application
Outlook	I-Application
e-mails	O
.	O
</s>
<s>
Other	O
protocol	O
handlers	O
and	O
IFilters	B-Library
can	O
be	O
installed	O
as	O
needed	O
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
allows	O
network	O
shares	O
to	O
be	O
added	O
to	O
the	O
index	O
.	O
</s>
<s>
The	O
Windows	O
Desktop	B-Application
Search	I-Application
functionality	O
is	O
exposed	O
via	O
a	O
Windows	O
Taskbar	O
mounted	O
deskbar	O
,	O
accessible	O
via	O
a	O
++	O
keyboard	O
shortcut	O
.	O
</s>
<s>
It	O
also	O
integrates	O
as	O
a	O
Windows	B-Protocol
Explorer	I-Protocol
window	O
.	O
</s>
<s>
For	O
example	O
,	O
"	O
!	O
calc	O
"	O
opens	O
the	O
Windows	B-Application
Calculator	I-Application
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
was	O
initially	O
released	O
as	O
MSN	B-Application
Desktop	I-Application
Search	I-Application
,	O
as	O
a	O
part	O
of	O
the	O
MSN	B-Application
Toolbar	I-Application
suite	O
.	O
</s>
<s>
It	O
was	O
re-introduced	O
as	O
Windows	O
Desktop	B-Application
Search	I-Application
with	O
version	O
2	O
,	O
while	O
still	O
being	O
distributed	O
with	O
MSN	B-Application
Toolbar	I-Application
Suite	O
.	O
</s>
<s>
For	O
Windows	B-Application
2000	I-Application
,	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
,	O
it	O
came	O
in	O
two	O
flavors	O
,	O
one	O
for	O
home	O
users	O
and	O
the	O
other	O
for	O
enterprise	O
use	O
.	O
</s>
<s>
The	O
home	O
edition	O
was	O
bundled	O
with	O
MSN	B-Application
Toolbar	I-Application
,	O
while	O
the	O
other	O
was	O
available	O
as	O
a	O
standalone	O
application	O
.	O
</s>
<s>
Later	O
,	O
when	O
MSN	B-Application
Toolbar	I-Application
was	O
discontinued	O
in	O
favor	O
of	O
Windows	B-Application
Live	I-Application
Toolbar	I-Application
,	O
the	O
home	O
edition	O
of	O
Windows	O
Desktop	B-Application
Search	I-Application
was	O
discontinued	O
as	O
well	O
.	O
</s>
<s>
The	O
last	O
version	O
available	O
for	O
Windows	B-Application
2000	I-Application
is	O
Windows	O
Desktop	B-Application
Search	I-Application
2.66	O
.	O
</s>
<s>
For	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
,	O
version	O
3.0	O
of	O
Windows	O
Desktop	B-Application
Search	I-Application
was	O
provided	O
as	O
a	O
standalone	O
release	O
–	O
separate	O
from	O
Windows	B-Application
Live	I-Application
Toolbar	I-Application
.	O
</s>
<s>
One	O
of	O
the	O
significant	O
new	O
features	O
is	O
Windows	O
Desktop	B-Application
Search	I-Application
3.0	O
also	O
installs	O
the	O
Property	O
System	O
on	O
Windows	B-Application
XP	I-Application
introduced	O
in	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
3.0	O
is	O
geared	O
for	O
pre-Windows	O
Vista	O
users	O
,	O
hence	O
the	O
indexer	O
was	O
implemented	O
as	O
a	O
Windows	O
Service	O
,	O
rather	O
than	O
as	O
a	O
per-user	O
application	O
,	O
so	O
that	O
the	O
same	O
index	O
as	O
well	O
as	O
a	O
single	O
instance	O
of	O
the	O
service	O
can	O
be	O
shared	O
across	O
all	O
users	O
–	O
thereby	O
improving	O
performance	O
.	O
</s>
<s>
Windows	O
Desktop	B-Application
Search	I-Application
found	O
itself	O
in	O
the	O
midst	O
of	O
a	O
controversy	O
on	O
October	O
25	O
,	O
2007	O
,	O
when	O
Windows	O
Desktop	B-Application
Search	I-Application
3.01	O
was	O
automatically	O
pushed	O
out	O
and	O
installed	O
on	O
Windows	O
when	O
updated	O
via	O
Windows	O
Server	O
Update	O
Services	O
(	O
WSUS	O
)	O
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
and	O
Windows	B-Device
Server	I-Device
2008	I-Device
introduced	O
Instant	O
Search	O
in	O
the	O
Start	O
menu	O
and	O
in	O
Windows	B-Protocol
Explorer	I-Protocol
.	O
</s>
<s>
It	O
offers	O
a	O
superset	O
of	O
the	O
features	O
provided	O
by	O
Windows	O
Desktop	B-Application
Search	I-Application
(	O
WDS	O
)	O
,	O
while	O
being	O
API	B-Application
compatible	O
with	O
it	O
.	O
</s>
<s>
Unlike	O
WDS	O
,	O
it	O
can	O
seamlessly	O
search	O
indexed	O
as	O
well	O
as	O
non-indexed	O
locations	O
–	O
for	O
indexed	O
locations	O
the	O
index	O
is	O
used	O
and	O
for	O
non-indexed	O
locations	O
,	O
the	O
property	O
handlers	O
and	O
IFilters	B-Library
are	O
invoked	O
on	O
the	O
fly	O
as	O
the	O
search	O
is	O
being	O
performed	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
uses	O
Group	O
Policy	O
for	O
centralized	O
management	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
also	O
supports	O
queries	O
against	O
a	O
remote	O
index	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
indexes	O
offline	O
caches	O
of	O
network	O
shares	O
,	O
in	O
addition	O
to	O
the	O
local	O
file	O
systems	O
.	O
</s>
<s>
This	O
means	O
if	O
the	O
file	O
server	O
,	O
on	O
which	O
a	O
network	O
file	O
share	O
is	O
hosted	O
,	O
is	O
running	O
either	O
Windows	B-Application
Vista	I-Application
or	O
a	O
later	O
version	O
of	O
Windows	O
or	O
Windows	B-Application
Search	I-Application
4.0	I-Application
on	O
Windows	B-Application
XP	I-Application
,	O
any	O
searches	O
against	O
the	O
share	O
will	O
be	O
queried	O
against	O
the	O
server	O
's	O
index	O
and	O
present	O
the	O
results	O
to	O
the	O
client	O
system	O
,	O
filtering	O
out	O
the	O
files	O
the	O
user	O
does	O
not	O
have	O
access	O
to	O
.	O
</s>
<s>
Microsoft	B-Application
Outlook	I-Application
e-mail	O
stores	O
starting	O
with	O
Outlook	B-Application
2007	I-Application
,	O
though	O
Outlook	B-Application
2002	I-Application
and	O
Outlook	B-Application
2003	I-Application
and	O
Microsoft	B-Application
OneNote	I-Application
stores	O
are	O
also	O
indexed	O
if	O
installed	O
alongside	O
Windows	B-Application
Search	I-Application
.	O
</s>
<s>
Unlike	O
Windows	O
Desktop	B-Application
Search	I-Application
on	O
Windows	B-Application
XP	I-Application
,	O
the	O
Windows	B-Application
Search	I-Application
indexer	O
performs	O
the	O
I/O	O
operations	O
with	O
low	O
priority	O
,	O
the	O
process	O
also	O
runs	O
with	O
low	O
CPU	O
priority	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
supports	O
natural	O
language	O
searches	O
;	O
so	O
the	O
user	O
can	O
search	O
for	O
things	O
like	O
"	O
photo	O
taken	O
last	O
week	O
"	O
or	O
"	O
email	O
sent	O
from	O
Dave	O
"	O
.	O
</s>
<s>
The	O
search	O
functionality	O
is	O
exposed	O
using	O
the	O
search	O
bars	O
in	O
the	O
Start	O
menu	O
and	O
the	O
upper	O
right	O
hand	O
corner	O
of	O
Windows	B-Protocol
Explorer	I-Protocol
windows	O
,	O
as	O
well	O
as	O
Open/Save	O
dialog	O
boxes	O
.	O
</s>
<s>
However	O
,	O
unlike	O
WDS	O
,	O
Windows	B-Application
Search	I-Application
does	O
not	O
support	O
creating	O
aliases	O
.	O
</s>
<s>
There	O
is	O
also	O
a	O
Search	O
Explorer	O
,	O
which	O
is	O
an	O
integrated	O
Windows	B-Protocol
Explorer	I-Protocol
window	O
that	O
is	O
used	O
for	O
searches	O
.	O
</s>
<s>
It	O
presents	O
the	O
user	O
interface	B-Application
to	O
specify	O
the	O
search	O
parameters	O
,	O
including	O
locations	O
and	O
file	O
types	O
that	O
should	O
be	O
searched	O
,	O
and	O
certain	O
operators	O
,	O
without	O
crafting	O
the	O
AQS	O
queries	O
by	O
hand	O
.	O
</s>
<s>
With	O
Windows	B-Application
Vista	I-Application
SP1	O
,	O
third-party	O
applications	O
will	O
be	O
able	O
to	O
override	O
the	O
Search	O
Explorer	O
as	O
the	O
default	O
search	O
interface	B-Application
so	O
that	O
the	O
registered	O
third-party	O
application	O
will	O
be	O
launched	O
,	O
instead	O
of	O
bringing	O
up	O
the	O
Search	O
Explorer	O
,	O
when	O
invoked	O
by	O
any	O
means	O
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
also	O
supports	O
query	O
composition	O
,	O
where	O
a	O
saved	O
search	O
(	O
called	O
a	O
scope	O
)	O
can	O
be	O
nested	O
within	O
the	O
query	O
string	O
of	O
another	O
search	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
4.0	I-Application
(	O
also	O
previously	O
referred	O
to	O
as	O
Windows	B-Application
Live	I-Application
Search	I-Application
,	O
codenamed	O
Casino	O
or	O
OneView	O
)	O
is	O
the	O
successor	O
to	O
the	O
Windows	B-Application
Search	I-Application
platform	O
for	O
both	O
Windows	O
Desktop	B-Application
Search	I-Application
3.0	O
on	O
Windows	B-Application
XP	I-Application
as	O
well	O
as	O
Instant	O
Search	O
on	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
It	O
is	O
mainly	O
an	O
update	O
to	O
the	O
indexing	O
components	O
,	O
with	O
few	O
changes	O
to	O
the	O
Windows	B-Application
XP	I-Application
user	O
interface	B-Application
and	O
none	O
on	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
It	O
added	O
remote	O
query	O
support	O
to	O
Windows	B-Application
XP	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
based	O
systems	O
,	O
which	O
used	O
to	O
be	O
a	O
Vista-only	O
feature	O
.	O
</s>
<s>
This	O
allows	O
a	O
user	O
with	O
a	O
Vista	B-Application
client	O
(	O
or	O
an	O
XP	B-Application
client	O
with	O
Windows	B-Application
Search	I-Application
4.0	I-Application
)	O
to	O
search	O
the	O
index	O
of	O
networked	O
machines	O
which	O
are	O
also	O
running	O
a	O
supported	O
operating	O
system	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
4.0	I-Application
was	O
originally	O
proposed	O
by	O
Microsoft	O
's	O
Windows	O
Live	O
division	O
as	O
an	O
application	O
that	O
would	O
unify	O
local	O
and	O
remote	O
indexed	O
search	O
in	O
a	O
new	O
interface	B-Application
.	O
</s>
<s>
Early	O
screenshots	O
of	O
the	O
program	O
featured	O
the	O
new	O
"	O
flair	O
"	O
interface	B-Application
design	O
seen	O
in	O
other	O
Windows	O
Live	O
client	O
applications	O
of	O
the	O
time	O
such	O
as	O
Windows	B-Protocol
Live	I-Protocol
Messenger	I-Protocol
and	O
Windows	B-Application
Live	I-Application
Mail	I-Application
.	O
</s>
<s>
Windows	B-Application
Live	I-Application
Search	I-Application
Center	O
could	O
search	O
web	O
services	O
which	O
used	O
the	O
OpenSearch	B-Application
specification	O
to	O
make	O
search	O
results	O
available	O
as	O
web	B-General_Concept
feeds	I-General_Concept
.	O
</s>
<s>
It	O
could	O
aggregate	O
searches	O
from	O
various	O
indexes	O
including	O
the	O
Windows	O
Desktop	B-Application
Search	I-Application
index	O
,	O
Windows	B-Application
RSS	I-Application
Platform	I-Application
common	O
feed	O
store	O
,	O
and	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
and	O
Microsoft	B-Protocol
SharePoint	I-Protocol
indexes	O
,	O
among	O
others	O
.	O
</s>
<s>
The	O
first	O
beta	O
of	O
Windows	B-Application
Search	I-Application
4.0	I-Application
was	O
released	O
on	O
March	O
27	O
,	O
2008	O
.	O
</s>
<s>
It	O
included	O
numerous	O
performance	O
improvements	O
to	O
the	O
indexer	O
and	O
brought	O
new	O
features	O
,	O
including	O
previously	O
Vista-exclusive	O
ones	O
,	O
to	O
XP	B-Application
,	O
including	O
Group	O
Policy	O
integration	O
,	O
federation	O
of	O
searches	O
to	O
remote	O
indexes	O
,	O
support	O
for	O
EFS-encrypted	O
files	O
and	O
Vista-style	O
preview	O
handlers	O
that	O
allow	O
document-type	O
specific	O
browsing	O
of	O
documents	O
in	O
the	O
preview	O
pane	O
.	O
</s>
<s>
Windows	B-Application
Search	I-Application
4.0	I-Application
was	O
released	O
on	O
June	O
3	O
,	O
2008	O
,	O
and	O
is	O
supported	O
on	O
XP	B-Application
,	O
Windows	B-Application
Server	I-Application
2003	I-Application
,	O
Vista	B-Application
,	O
Windows	B-Device
Server	I-Device
2008	I-Device
and	O
Windows	B-Application
Home	I-Application
Server	I-Application
.	O
</s>
<s>
In	O
Windows	B-Operating_System
10	I-Operating_System
,	O
Windows	B-Application
Search	I-Application
was	O
added	O
to	O
the	O
taskbar	O
in	O
place	O
of	O
the	O
Start	O
menu	O
in	O
earlier	O
versions	O
of	O
Windows	O
.	O
</s>
<s>
The	O
landing	O
page	O
also	O
provides	O
quick	O
searches	O
provided	O
from	O
Bing	B-Application
for	O
the	O
weather	O
,	O
top	O
news	O
stories	O
,	O
today	O
in	O
history	O
and	O
new	O
movies	O
.	O
</s>
<s>
The	O
landing	O
page	O
allows	O
the	O
user	O
to	O
filter	O
searches	O
depending	O
on	O
whether	O
the	O
user	O
looking	O
for	O
documents	O
,	O
pictures	O
or	O
settings	B-Application
.	O
</s>
<s>
Spell-correction	O
was	O
also	O
added	O
to	O
Windows	B-Application
Search	I-Application
when	O
searching	O
for	O
Apps	O
&	O
Settings	B-Application
to	O
ensure	O
a	O
wider	O
range	O
of	O
results	O
were	O
shown	O
.	O
</s>
<s>
The	O
search	O
box	O
in	O
File	B-Protocol
Explorer	I-Protocol
now	O
opens	O
as	O
soon	O
as	O
you	O
click	O
in	O
the	O
box	O
and	O
provides	O
a	O
dropdown	O
of	O
recent	O
searches	O
.	O
</s>
<s>
The	O
Windows	B-Application
Search	I-Application
index	O
is	O
built	O
locally	O
on	O
the	O
PC	O
and	O
no	O
information	O
is	O
sent	O
to	O
Microsoft	O
.	O
</s>
