<s>
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
(	O
formerly	O
WinFrame	O
,	O
MetaFrame	O
,	O
Presentation	O
Server	B-Application
and	O
XenApp	B-General_Concept
)	O
is	O
an	O
application	B-Operating_System
virtualization	I-Operating_System
software	O
produced	O
by	O
Citrix	B-Application
Systems	I-Application
that	O
allows	O
Windows	B-Application
applications	I-Application
to	O
be	O
accessed	O
via	O
individual	O
devices	O
from	O
a	O
shared	O
server	B-Application
or	O
cloud	B-Architecture
system	I-Architecture
.	O
</s>
<s>
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
is	O
application	B-Operating_System
virtualization	I-Operating_System
software	O
that	O
delivers	O
centrally-hosted	O
Windows	B-Application
applications	I-Application
to	O
local	O
devices	O
without	O
the	O
necessity	O
of	O
installing	B-Application
them	O
.	O
</s>
<s>
It	O
is	O
the	O
flagship	O
product	O
for	O
Citrix	B-Application
and	O
was	O
formerly	O
known	O
under	O
the	O
names	O
WinFrame	O
,	O
MetaFrame	O
,	O
and	O
Presentation	O
Server	B-Application
.	O
</s>
<s>
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
software	O
uses	O
FlexCast	O
Management	O
Architecture	O
(	O
FMA	O
)	O
,	O
a	O
proprietary	B-Application
architecture	O
for	O
Citrix	B-Application
virtualization	O
products	O
.	O
</s>
<s>
It	O
delivers	O
individual	O
applications	O
,	O
as	O
opposed	O
to	O
entire	O
desktops	B-Protocol
,	O
to	O
devices	O
.	O
</s>
<s>
It	O
is	O
also	O
used	O
with	O
Citrix	B-Application
Workspace	I-Application
to	O
deliver	O
apps	O
as	O
part	O
of	O
a	O
complete	O
virtual	O
desktop	O
environment	O
.	O
</s>
<s>
With	O
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
,	O
Windows	B-Application
applications	I-Application
can	O
be	O
used	O
on	O
devices	O
that	O
typically	O
could	O
not	O
run	O
them	O
,	O
including	O
Macintosh	B-Device
computers	O
,	O
mobile	B-Application
devices	I-Application
,	O
Google	B-Application
Chromebooks	B-Operating_System
,	O
and	O
Linux	B-Application
computers	O
.	O
</s>
<s>
Conversely	O
,	O
it	O
enables	O
otherwise	O
incompatible	O
apps	O
to	O
run	O
on	O
Windows	B-Application
desktops	B-Protocol
.	O
</s>
<s>
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
is	O
accessed	O
on	O
all	O
devices	O
via	O
Citrix	B-Application
Receiver	I-Application
.	O
</s>
<s>
The	O
software	O
can	O
be	O
delivered	O
from	O
on-premises	O
data	B-Operating_System
centers	I-Operating_System
or	O
public	O
,	O
private	O
,	O
or	O
hybrid	O
clouds	O
.	O
</s>
<s>
The	O
precursor	O
to	O
Virtual	O
Apps	O
was	O
called	O
WinFrame	O
,	O
a	O
multi-user	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
based	O
on	O
Windows	B-Device
NT	I-Device
3.51	I-Device
.	O
</s>
<s>
Released	O
in	O
1995	O
,	O
WinFrame	O
was	O
one	O
of	O
the	O
first	O
products	O
distributed	O
by	O
Citrix	B-Application
.	O
</s>
<s>
At	O
this	O
stage	O
of	O
the	O
product	O
development	O
Citrix	B-Application
Systems	I-Application
licensed	O
the	O
Windows	B-Device
NT	I-Device
3.51	I-Device
base	O
operating	B-General_Concept
system	I-General_Concept
from	O
Microsoft	O
.	O
</s>
<s>
The	O
core	O
development	O
that	O
Citrix	B-Application
delivered	O
was	O
the	O
MultiWin	O
engine	O
.	O
</s>
<s>
This	O
allowed	O
multiple	B-Operating_System
users	I-Operating_System
to	O
logon	O
and	O
execute	O
applications	O
on	O
a	O
WinFrame	O
server	B-Application
.	O
</s>
<s>
Citrix	B-Application
was	O
to	O
later	O
license	O
the	O
MultiWin	O
technology	O
to	O
Microsoft	O
,	O
forming	O
the	O
basis	O
of	O
Microsoft	O
's	O
Terminal	O
Services	O
.	O
</s>
<s>
Repackaged	O
versions	O
of	O
Windows	B-Application
95	O
,	O
with	O
Citrix	B-Application
WinFrame	O
Client	O
included	O
,	O
were	O
also	O
available	O
from	O
Citrix	B-Application
.	O
</s>
<s>
The	O
product	O
was	O
renamed	O
several	O
times	O
:	O
it	O
became	O
MetaFrame	O
XP	O
in	O
2002	O
,	O
MetaFrame	O
XP	O
Presentation	O
Server	B-Application
in	O
2003	O
,	O
and	O
then	O
was	O
rebranded	O
as	O
Presentation	O
Server	B-Application
in	O
2005	O
.	O
</s>
<s>
Each	O
of	O
these	O
products	O
focused	O
on	O
remote	B-Protocol
access	I-Protocol
of	O
applications	O
and	O
server-based	O
computing	O
.	O
</s>
<s>
In	O
2008	O
,	O
the	O
product	O
was	O
renamed	O
XenApp	B-General_Concept
.	O
</s>
<s>
Between	O
2010	O
and	O
2012	O
,	O
Citrix	B-Application
issued	O
two	O
updates	O
of	O
XenApp	B-General_Concept
.	O
</s>
<s>
XenApp	B-General_Concept
6	O
launched	O
in	O
2010	O
and	O
included	O
a	O
new	O
central	O
management	O
console	O
called	O
AppCenter	O
.	O
</s>
<s>
In	O
2012	O
,	O
XenApp	B-General_Concept
6.5	O
was	O
released	O
and	O
this	O
update	O
included	O
a	O
new	O
feature	O
called	O
Instant	O
App	O
Access	O
,	O
which	O
aimed	O
to	O
reduce	O
application	O
launch	O
time	O
.	O
</s>
<s>
This	O
update	O
combined	O
XenDesktop	O
and	O
XenApp	B-General_Concept
into	O
one	O
application	O
called	O
XenDesktop	O
under	O
the	O
Flex	O
Management	O
Architecture	O
(	O
FMA	O
)	O
.	O
</s>
<s>
Prior	O
to	O
this	O
,	O
all	O
versions	O
of	O
XenApp	B-General_Concept
used	O
the	O
company	O
's	O
Independent	O
Management	O
Architecture	O
(	O
IMA	O
)	O
.	O
</s>
<s>
In	O
2014	O
,	O
version	O
7.5	O
was	O
released	O
as	O
XenApp	B-General_Concept
,	O
separate	O
from	O
XenDesktop	O
,	O
but	O
it	O
was	O
also	O
built	O
on	O
FMA	O
.	O
</s>
<s>
In	O
2018	O
,	O
XenApp	B-General_Concept
was	O
rebranded	O
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
.	O
</s>
<s>
More	O
recently	O
,	O
Citrix	B-Application
has	O
introduced	O
a	O
cloud-based	B-Architecture
solution	O
known	O
as	O
Citrix	B-Application
DaaS	O
,	O
which	O
it	O
positions	O
as	O
a	O
successor	O
to	O
its	O
on-premise	O
Citrix	B-General_Concept
Virtual	I-General_Concept
Apps	I-General_Concept
and	O
Desktops	B-Protocol
(	O
CVAD	O
)	O
offering	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
still	O
releasing	O
new	O
Virtual	O
Apps	O
and	O
Desktops	B-Protocol
versions	O
,	O
to	O
meet	O
the	O
needs	O
of	O
customers	O
who	O
prefer	O
or	O
require	O
an	O
on-premise	O
solution	O
.	O
</s>
