<s>
iCore	B-Application
Virtual	I-Application
Accounts	I-Application
is	O
free	O
download	O
OS	B-Application
level	I-Application
virtualization	I-Application
(	O
container-based	O
virtualization	O
)	O
for	O
Microsoft	B-Application
Windows	I-Application
XP	I-Application
.	O
</s>
<s>
The	O
program	O
is	O
an	O
isolated	O
virtual	B-Architecture
machine	I-Architecture
that	O
runs	O
on	O
top	O
of	O
the	O
existing	O
hardware	B-Architecture
and	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
It	O
allows	O
the	O
user	O
to	O
create	O
multiple	O
virtual	B-Application
"	O
accounts	O
"	O
(	O
virtual	B-Architecture
machines	I-Architecture
)	O
that	O
can	O
be	O
easily	O
created	O
or	O
deleted	O
without	O
affecting	O
each	O
other	O
's	O
state	O
or	O
the	O
state	O
of	O
the	O
core	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Such	O
machines	O
create	O
and	O
capture	O
the	O
output	O
of	O
a	O
virtual	B-Application
"	O
account	O
"	O
inside	O
a	O
virtual	B-Application
disk	O
.	O
</s>
<s>
Only	O
the	O
changes	O
to	O
specific	O
files	O
and	O
programs	O
accessible	O
to	O
that	O
virtual	B-Application
account	O
will	O
be	O
stored	O
in	O
the	O
virtual	B-Application
disk	O
attached	O
to	O
that	O
account	O
.	O
</s>
<s>
One	O
can	O
install	O
programs	O
inside	O
it	O
that	O
will	O
be	O
sandboxed	O
from	O
the	O
entire	O
system	O
,	O
existing	O
only	O
inside	O
the	O
virtual	B-Application
disk	O
.	O
</s>
<s>
Each	O
virtual	B-Application
account	O
has	O
full	O
dedicated	O
PC	O
functionality	O
with	O
its	O
own	O
processes	O
,	O
files	O
,	O
and	O
applications	O
.	O
</s>
<s>
This	O
is	O
accomplished	O
by	O
using	O
a	O
virtualization	O
layer	O
in	O
the	O
kernel	O
of	O
the	O
host	O
OS	B-General_Concept
.	O
</s>
<s>
In	O
contrast	O
,	O
programs	O
accessible	O
to	O
all	O
users	O
of	O
the	O
computer	O
will	O
be	O
usable	O
in	O
the	O
virtual	B-Application
accounts	O
without	O
taking	O
up	O
space	O
there	O
,	O
but	O
the	O
settings	O
and	O
bookmarks	O
for	O
the	O
users	O
of	O
that	O
account	O
will	O
stay	O
inside	O
the	O
virtual	B-Application
disk	O
.	O
</s>
<s>
For	O
every	O
application	O
and/or	O
user	O
,	O
the	O
program	O
is	O
an	O
autonomous	O
OS	B-General_Concept
,	O
with	O
its	O
own	O
registry	O
,	O
process	O
,	O
files	O
,	O
services	O
and	O
so	O
on	O
.	O
</s>
<s>
Software	O
from	O
vendors	O
can	O
run	O
inside	O
a	O
container	B-Application
without	O
modification	O
.	O
</s>
<s>
As	O
of	O
December	O
20	O
,	O
2010	O
,	O
iCore	O
only	O
supports	O
Windows	B-Application
XP	I-Application
.	O
</s>
