<s>
A	O
compositing	B-Operating_System
window	I-Operating_System
manager	I-Operating_System
,	O
or	O
compositor	O
,	O
is	O
a	O
window	B-Application
manager	I-Application
that	O
provides	O
applications	O
with	O
an	O
off-screen	O
buffer	B-General_Concept
for	O
each	O
window	O
.	O
</s>
<s>
The	O
window	B-Application
manager	I-Application
composites	O
the	O
window	O
buffers	B-General_Concept
into	O
an	O
image	O
representing	O
the	O
screen	O
and	O
writes	O
the	O
result	O
into	O
the	O
display	O
memory	O
.	O
</s>
<s>
Compositing	B-Operating_System
window	I-Operating_System
managers	I-Operating_System
may	O
perform	O
additional	O
processing	O
on	O
buffered	O
windows	O
,	O
applying	O
2D	O
and	O
3D	O
animated	O
effects	O
such	O
as	O
blending	B-Algorithm
,	O
fading	O
,	O
scaling	B-Algorithm
,	O
rotation	B-General_Concept
,	O
duplication	O
,	O
bending	O
and	O
contortion	O
,	O
shuffling	O
,	O
blurring	B-Error_Name
,	O
redirecting	O
applications	O
,	O
and	O
translating	B-Algorithm
windows	O
into	O
one	O
of	O
a	O
number	O
of	O
displays	B-Device
and	O
virtual	B-Application
desktops	I-Application
.	O
</s>
<s>
Since	O
the	O
screen	O
is	O
double	O
buffered	O
,	O
it	O
does	O
not	O
flicker	B-General_Concept
during	O
updates	O
.	O
</s>
<s>
The	O
most	O
commonly	O
used	O
compositing	B-Operating_System
window	I-Operating_System
managers	I-Operating_System
include	O
:	O
</s>
<s>
for	O
Linux	B-Application
,	O
BSD	B-Operating_System
,	O
Hurd	B-Application
and	O
OpenSolaris	B-Operating_System
:	O
Compiz	B-Language
,	O
KWin	B-Language
,	O
Xfwm	B-Device
,	O
Enlightenment	B-Application
,	O
Mutter	B-Language
,	O
xcompmgr	O
and	O
picom	B-Operating_System
;	O
</s>
<s>
for	O
macOS	B-Application
:	O
the	O
Quartz	B-Operating_System
Compositor	O
.	O
</s>
<s>
The	O
window	B-Application
manager	I-Application
sends	O
each	O
window	O
a	O
message	B-Architecture
to	O
repaint	O
itself	O
whenever	O
appropriate	O
(	O
such	O
as	O
when	O
it	O
is	O
resized	O
,	O
or	O
when	O
another	O
window	O
passes	O
in	O
front	O
of	O
it	O
)	O
.	O
</s>
<s>
With	O
a	O
stacking	O
manager	O
,	O
the	O
repainting	O
process	O
can	O
become	O
corrupted	O
when	O
a	O
program	O
that	O
is	O
slow	O
,	O
unresponsive	O
or	O
buggy	B-Error_Name
does	O
not	O
respond	O
to	O
messages	O
in	O
a	O
timely	O
manner	O
.	O
</s>
<s>
With	O
a	O
compositing	B-Operating_System
manager	I-Operating_System
,	O
if	O
a	O
window	O
stops	O
repainting	O
itself	O
when	O
requested	O
by	O
the	O
window	B-Application
manager	I-Application
,	O
its	O
last	O
repaint	O
will	O
remain	O
displayed	O
and	O
the	O
window	O
might	O
be	O
dimmed	O
.	O
</s>
<s>
One	O
of	O
the	O
first	O
systems	O
with	O
a	O
compositing	O
windowing	O
system	O
was	O
the	O
Commodore	B-Device
Amiga	I-Device
,	O
released	O
in	O
1985	O
.	O
</s>
<s>
The	O
Amiga	B-Device
windowing	O
system	O
would	O
then	O
use	O
a	O
series	O
of	O
bit	B-Algorithm
blits	I-Algorithm
using	O
the	O
system	O
's	O
hardware	O
blitter	B-General_Concept
to	O
build	O
a	O
composite	O
of	O
these	O
applications	O
 '	O
bitmaps	O
-	O
along	O
with	O
buttons	O
and	O
sliders	O
-	O
in	O
display	O
memory	O
,	O
without	O
requiring	O
these	O
applications	O
to	O
redraw	O
any	O
of	O
their	O
bitmaps	O
.	O
</s>
<s>
On	O
March	O
24	O
,	O
2001	O
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.0	I-Operating_System
became	O
the	O
first	O
mainstream	O
operating	B-General_Concept
system	I-General_Concept
to	O
feature	O
software-based	O
3D	O
compositing	O
and	O
effects	O
,	O
provided	O
by	O
its	O
Quartz	B-Operating_System
component	O
.	O
</s>
<s>
With	O
the	O
release	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
and	O
Quartz	B-Operating_System
Extreme	O
,	O
the	O
job	O
of	O
compositing	O
could	O
move	O
to	O
dedicated	O
graphics	B-General_Concept
hardware	I-General_Concept
.	O
</s>
<s>
In	O
2003	O
Sun	O
Microsystems	O
demonstrated	O
an	O
ambitious	O
3D	O
graphics	O
system	O
called	O
Project	B-Language
Looking	I-Language
Glass	I-Language
to	O
layer	O
on	O
top	O
of	O
its	O
Swing	B-Language
toolkit	O
.	O
</s>
<s>
Although	O
Apple	O
threatened	O
to	O
sue	O
Sun	O
for	O
breach	O
of	O
intellectual-property	O
rights	O
,	O
other	O
window	B-Application
managers	I-Application
have	O
implemented	O
some	O
of	O
the	O
functionality	O
in	O
Looking	O
Glass	O
.	O
</s>
<s>
By	O
2006	O
development	O
was	O
discontinued	O
by	O
Sun	O
,	O
whose	O
primary	O
business	O
was	O
transitioning	O
from	O
graphically	O
oriented	O
Unix	B-Device
workstations	I-Device
to	O
selling	O
enterprise	B-Application
mainframes	O
.	O
</s>
<s>
Microsoft	O
first	O
presented	O
the	O
Desktop	O
Window	B-Application
Manager	I-Application
in	O
Project	B-Application
Longhorn	I-Application
to	O
the	O
2003	O
Windows	O
Hardware	O
Engineering	O
Conference	O
,	O
demonstrating	O
wobbly	O
windows	O
.	O
</s>
<s>
Severe	O
delays	O
in	O
the	O
development	O
of	O
Longhorn	O
caused	O
Microsoft	O
not	O
to	O
debut	O
its	O
3D-compositing	O
window-manager	O
until	O
the	O
release	O
of	O
Windows	B-Application
Vista	I-Application
in	O
January	O
2007	O
.	O
</s>
<s>
Implementing	O
compositing	O
under	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
required	O
some	O
redesign	O
,	O
which	O
took	O
place	O
incrementally	O
.	O
</s>
<s>
Metacity	B-Language
2.8.4	O
was	O
released	O
in	O
August	O
2004	O
.	O
</s>
<s>
However	O
,	O
the	O
first	O
widely	O
publicized	O
compositing	B-Operating_System
window	I-Operating_System
manager	I-Operating_System
for	O
X	B-Operating_System
was	O
Xfwm	B-Device
,	O
released	O
in	O
January	O
2005	O
.	O
</s>
<s>
On	O
26	O
January	O
2005	O
Compiz	B-Language
was	O
released	O
,	O
introducing	O
fully	O
accelerated	O
3D-compositing	O
to	O
the	O
Linux	B-Application
platform	O
.	O
</s>
<s>
KDE	B-Application
's	O
KWin	B-Language
also	O
supports	O
compositing	O
.	O
</s>
<s>
Modern	O
compositing	B-Operating_System
window	I-Operating_System
managers	I-Operating_System
use	O
3D	O
hardware	O
acceleration	O
.	O
</s>
<s>
Compositing	B-Operating_System
window	I-Operating_System
manager	I-Operating_System
software	O
communicates	O
with	O
graphics	B-General_Concept
hardware	I-General_Concept
via	O
programming	B-Application
interfaces	I-Application
such	O
as	O
OpenGL	B-Application
or	O
Direct3D	B-Application
.	O
</s>
<s>
The	O
earliest	O
widespread	O
implementations	O
using	O
this	O
technique	O
were	O
released	O
for	O
the	O
Mac	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.2	I-Operating_System
,	O
and	O
for	O
Linux	B-Application
in	O
a	O
Luminocity	O
prototype	O
.	O
</s>
<s>
Currently	O
,	O
window	B-Application
managers	I-Application
using	O
OpenGL	B-Application
include	O
Compiz	B-Language
,	O
KWin	B-Language
,	O
and	O
the	O
Quartz	B-Operating_System
Compositor	O
,	O
while	O
Desktop	O
Window	B-Application
Manager	I-Application
currently	O
uses	O
DirectX	O
9	O
.	O
</s>
<s>
OpenGL	B-Application
is	O
still	O
not	O
fully	O
supported	O
in	O
hardware	O
,	O
so	O
performance	O
of	O
OpenGL-based	O
compositing	O
should	O
continue	O
to	O
improve	O
as	O
hardware	O
improves	O
.	O
</s>
<s>
Stacking	B-Device
window	I-Device
managers	I-Device
running	O
on	O
X	B-Operating_System
server	I-Operating_System
required	O
a	O
chroma	O
keying	O
or	O
green	O
screening	O
extension	B-Protocol
.	O
</s>
<s>
Compositing	O
was	O
introduced	O
by	O
way	O
of	O
the	O
"	B-Device
Composite	I-Device
"	I-Device
extension	I-Device
.	O
</s>
<s>
Compositing	B-Operating_System
managers	I-Operating_System
use	O
hardware	O
acceleration	O
through	O
this	O
extension	B-Protocol
,	O
if	O
available	O
.	O
</s>
<s>
Under	O
Linux	B-Application
and	O
UNIX	O
,	O
the	O
ability	O
to	O
do	O
full	O
3D-accelerated	O
compositing	O
required	O
fundamental	O
changes	O
to	O
X11	B-Operating_System
in	O
order	O
to	O
use	O
hardware	O
acceleration	O
.	O
</s>
<s>
Originally	O
,	O
a	O
number	O
of	O
modified	O
X11	B-Operating_System
implementations	O
designed	O
around	O
OpenGL	B-Application
began	O
to	O
appear	O
,	O
including	O
Xgl	B-Application
.	O
</s>
<s>
The	O
introduction	O
of	O
AIGLX	B-Application
would	O
eliminate	O
the	O
need	O
to	O
use	O
Xgl	B-Application
,	O
and	O
allow	O
window	B-Application
managers	I-Application
to	O
do	O
3D	O
accelerated	O
compositing	O
on	O
a	O
standard	O
X	B-Operating_System
server	I-Operating_System
,	O
while	O
still	O
allowing	O
for	O
direct	B-Application
rendering	I-Application
.	O
</s>
<s>
Currently	O
,	O
NVIDIA	O
,	O
Intel	O
,	O
and	O
ATI	O
cards	O
support	O
AIGLX	B-Application
.	O
</s>
<s>
Compiz	B-Language
introduced	O
a	O
cube	O
effect	O
,	O
which	O
allows	O
the	O
user	O
to	O
see	O
up	O
to	O
6	O
virtual	B-Application
desktops	I-Application
at	O
once	O
.	O
</s>
<s>
Compiz	B-Language
displays	B-Device
a	O
wide	O
array	O
of	O
2D	O
and	O
3D	O
effects	O
and	O
has	O
relatively	O
low	O
hardware	O
requirements	O
.	O
</s>
<s>
In	O
2012	O
,	O
Compiz	B-Language
was	O
included	O
in	O
Ubuntu	B-Operating_System
Linux	I-Operating_System
,	O
and	O
was	O
enabled	O
automatically	O
when	O
supported	O
hardware	O
and	O
drivers	O
were	O
available	O
and	O
the	O
user	O
had	O
not	O
selected	O
2D	O
Mode	O
.	O
</s>
<s>
Mutter	B-Language
(	O
Metacity	B-Language
+	O
Clutter	B-Language
)	O
has	O
replaced	O
Metacity	B-Language
as	O
the	O
default	O
window	B-Application
manager	I-Application
for	O
GNOME	B-Application
.	O
</s>
<s>
It	O
is	O
featured	O
in	O
the	O
GNOME	B-Language
Shell	I-Language
component	O
of	O
GNOME	B-Application
3.0	O
.	O
</s>
<s>
It	O
uses	O
the	O
display	O
engine	O
Clutter	B-Language
,	O
which	O
has	O
been	O
ported	O
to	O
all	O
major	O
operating	B-General_Concept
systems	I-General_Concept
,	O
netbooks	B-Device
and	O
smartphones	B-Application
.	O
</s>
<s>
Since	O
version	O
4	O
,	O
KDE	B-Application
's	O
window	B-Application
manager	I-Application
KWin	B-Language
has	O
compositing	O
capabilities	O
.	O
</s>
<s>
KWin	B-Language
features	O
much	O
of	O
the	O
same	O
functionality	O
also	O
present	O
in	O
Compiz	B-Language
.	O
</s>
<s>
Project	B-Language
Looking	I-Language
Glass	I-Language
was	O
a	O
window	B-Application
manager	I-Application
combining	O
3D	O
rendering	O
and	O
the	O
cross-platform	O
Java	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
is	O
now	O
inactive	O
and	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
The	O
Granular	O
Linux	B-Application
live	O
CD	O
distribution	O
includes	O
Looking	O
Glass	O
as	O
an	O
optional	O
window	B-Application
manager	I-Application
.	O
</s>
<s>
In	O
the	O
aftermath	O
of	O
it	O
being	O
discontinued	O
,	O
some	O
of	O
its	O
features	O
,	O
such	O
as	O
cover	O
switching	O
and	O
thumbnail	O
live	O
previews	O
,	O
have	O
found	O
their	O
way	O
onto	O
other	O
window	B-Application
managers	I-Application
.	O
</s>
<s>
While	O
they	O
are	O
able	O
to	O
run	O
on	O
3D-capable	O
hardware	O
,	O
AmigaOS	O
4	O
and	O
MorphOS	B-Operating_System
are	O
designed	O
to	O
run	O
on	O
old	O
legacy	B-Device
Amiga	B-Device
computers	I-Device
,	O
starting	O
with	O
the	O
Amiga	B-Application
1200	I-Application
.	O
</s>
<s>
As	O
such	O
,	O
their	O
window	B-Application
managers	I-Application
have	O
mostly	O
planar	O
rendering	O
capabilities	O
that	O
include	O
composite	O
layering	O
,	O
alpha	B-Algorithm
blending	I-Algorithm
,	O
gradients	O
,	O
high	O
resolution	O
and	O
multiple	B-Application
desktops	I-Application
(	O
"	O
screens	O
"	O
)	O
that	O
can	O
partially	O
clip	O
one	O
another	O
.	O
</s>
<s>
While	O
the	O
window	B-Application
manager	I-Application
in	O
Windows	O
2000	O
does	O
perform	O
compositing	O
,	O
it	O
does	O
not	O
perform	O
transformations	O
such	O
as	O
a	O
per-pixel	O
alpha	O
.	O
</s>
<s>
Few	O
commercial	O
applications	O
took	O
advantage	O
of	O
alpha	B-Algorithm
blending	I-Algorithm
;	O
freeware	B-License
programs	O
were	O
among	O
the	O
first	O
to	O
experiment	O
with	O
it	O
,	O
albeit	O
through	O
optional	O
settings	O
.	O
</s>
<s>
Compositing	O
was	O
introduced	O
with	O
Desktop	O
Window	B-Application
Manager	I-Application
in	O
Windows	B-Application
Vista	I-Application
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
and	O
Windows	O
7	O
allow	O
the	O
user	O
to	O
disable	O
Desktop	O
Window	B-Application
Manager	I-Application
by	O
selecting	O
the	O
Windows	O
Basic	O
appearance	O
settings	O
.	O
</s>
<s>
In	O
addition	O
,	O
it	O
is	O
automatically	O
disabled	O
by	O
Windows	O
in	O
order	O
to	O
perform	O
hardware	B-Architecture
overlay	I-Architecture
through	O
the	O
Overlay	O
Mixer	O
Filter	O
.	O
</s>
<s>
Vector	O
graphics	O
,	O
such	O
as	O
TrueType	O
fonts	O
and	O
3D-accelerated	O
elements	O
,	O
can	O
be	O
expanded	O
without	O
degradation	O
(	O
usually	O
due	O
to	O
aliasing	B-Error_Name
)	O
.	O
</s>
<s>
Selection	O
begins	O
when	O
the	O
user	O
either	O
enters	O
a	O
hotkey	O
combination	O
,	O
moves	O
the	O
mouse	O
pointer	O
to	O
a	O
hotspot	B-General_Concept
on	I-General_Concept
the	I-General_Concept
screen	I-General_Concept
,	O
or	O
,	O
in	O
some	O
situations	O
,	O
uses	O
the	O
mouse	O
's	O
scroll	O
wheel	O
.	O
</s>
<s>
Common	O
implementations	O
of	O
flip	O
switching	O
include	O
Flip	O
3D	O
in	O
Windows	O
and	O
Shift	O
Switcher	O
in	O
Compiz	B-Language
.	O
</s>
<s>
Cover	O
Flow	O
is	O
an	O
implementation	O
of	O
cover	O
switching	O
in	O
macOS	B-Application
.	O
</s>
<s>
More	O
recent	O
versions	O
use	O
blurring	B-Error_Name
to	O
de-emphasize	O
non-selected	O
items	O
.	O
</s>
<s>
Cover	O
Flow	O
has	O
also	O
been	O
implemented	O
in	O
other	O
software	O
published	O
by	O
Apple	O
such	O
as	O
iTunes	B-Operating_System
.	O
</s>
<s>
Most	O
compositing	B-Operating_System
window	I-Operating_System
managers	I-Operating_System
include	O
this	O
feature	O
out	B-General_Concept
of	I-General_Concept
the	I-General_Concept
box	I-General_Concept
,	O
and	O
third-party	B-General_Concept
applications	I-General_Concept
,	O
such	O
as	O
,	O
are	O
also	O
available	O
.	O
</s>
<s>
In	O
Compiz	B-Language
,	O
the	O
window	O
frame	O
is	O
flipped	O
to	O
indicate	O
when	O
the	O
active	O
window	O
in	O
its	O
group	O
has	O
been	O
changed	O
.	O
</s>
<s>
macOS	B-Application
displays	B-Device
a	O
preview	O
of	O
every	O
window	O
on	O
the	O
screen	O
by	O
tiling	O
them	O
.	O
</s>
<s>
Other	O
systems	O
with	O
similar	O
functionality	O
(	O
Microsoft	O
Windows	O
,	O
Compiz	B-Language
,	O
KWin	B-Language
,	O
third-party	B-General_Concept
applications	I-General_Concept
)	O
are	O
referred	O
to	O
as	O
Exposé	O
clones	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
10.7	I-Application
combines	O
several	O
other	O
compositing	O
features	O
developed	O
by	O
Apple	O
—	O
such	O
as	O
Exposé	O
,	O
Dashboard	B-Application
,	O
and	O
Spaces	O
—	O
into	O
a	O
larger	O
program	O
called	O
Mission	O
Control	O
.	O
</s>
<s>
On	O
macOS	B-Application
,	O
"	O
widgets	O
"	O
(	O
single-purpose	O
applets	B-Language
)	O
such	O
as	O
a	O
clock	O
,	O
note	O
pad	O
,	O
and	O
calculator	O
can	O
appear	O
by	O
pressing	O
a	O
hotkey	O
.	O
</s>
<s>
They	O
are	O
handled	O
by	O
the	O
Dashboard	B-Application
program	O
in	O
macOS	B-Application
.	O
</s>
<s>
Compiz	B-Language
starts	O
with	O
a	O
blank	O
Widget	O
Layer	O
,	O
allowing	O
the	O
user	O
to	O
add	O
applications	O
by	O
clicking	O
on	O
them	O
.	O
</s>
<s>
A	O
variety	O
of	O
widgets	O
are	O
supported	O
,	O
including	O
Screenlets	B-Application
,	O
gDesklets	B-Application
and	O
SuperKaramba	B-Language
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
provides	O
gadgets	B-Application
that	O
the	O
user	O
can	O
place	O
on	O
the	O
Windows	O
Sidebar	O
(	O
Sidebar	B-Application
gadgets	I-Application
)	O
,	O
a	O
Windows	O
Live	O
start	O
page	O
(	O
Web	O
gadgets	B-Application
)	O
,	O
or	O
an	O
external	O
display	O
,	O
such	O
as	O
the	O
user	O
's	O
mobile	O
phone	O
(	O
SideShow	O
gadgets	B-Application
)	O
.	O
</s>
<s>
The	O
Windows	O
Sidebar	O
was	O
a	O
visible	O
partition	O
in	O
Windows	B-Application
Vista	I-Application
,	O
and	O
was	O
eliminated	O
in	O
Windows	O
7	O
,	O
along	O
with	O
Sidebar	B-Application
gadgets	I-Application
which	O
were	O
changed	O
to	O
Desktop	B-Application
Gadgets	I-Application
.	O
</s>
<s>
Before	O
compositing	B-Operating_System
window	I-Operating_System
managers	I-Operating_System
were	O
developed	O
,	O
windows	O
would	O
instantly	O
jump	O
in	O
and	O
out	O
of	O
view	O
,	O
which	O
is	O
incongruent	O
with	O
the	O
interface	O
metaphor	O
(	O
and	O
with	O
a	O
physical	O
office	O
setting	O
)	O
.	O
</s>
<s>
Some	O
systems	O
like	O
the	O
Classic	B-Application
Mac	I-Application
OS	I-Application
avoided	O
this	O
issue	O
with	O
ZoomRects	O
,	O
animating	O
the	O
windows	O
outline	O
"	O
zooming	O
"	O
toward	O
its	O
final	O
position	O
.	O
</s>
<s>
But	O
on	O
most	O
systems	O
,	O
the	O
sudden	O
appearance	O
and	O
disappearance	O
of	O
GUI	B-Application
elements	O
may	O
seem	O
confusing	O
or	O
even	O
chaotic	O
to	O
inexperienced	O
users	O
.	O
</s>
<s>
Visual	O
transitions	O
provide	O
context	O
and	O
help	O
distinguish	O
the	O
causal	O
relationships	O
of	O
GUI	B-Application
elements	O
.	O
</s>
<s>
Metisse	B-Device
implements	O
user	O
interface	O
façades	O
,	O
a	O
system	O
that	O
provides	O
users	O
with	O
simple	O
ways	O
to	O
adapt	O
,	O
reconfigure	O
,	O
and	O
recombine	O
existing	O
graphical	B-Application
interfaces	I-Application
,	O
through	O
the	O
use	O
of	O
direct	O
manipulation	O
techniques	O
.	O
</s>
<s>
,	O
a	O
three-dimensional	O
workspace	B-Application
manager	O
and	O
general-purpose	O
platform	O
for	O
3D	O
user	O
interfaces	O
.	O
</s>
<s>
–	O
a	O
bug-fixed	O
fork	O
of	O
dcompmgr	O
,	O
which	O
is	O
a	O
fork	O
of	O
xcompmgr	O
.	O
</s>
<s>
-a	O
lightweight	O
compositor	O
for	O
X11	B-Operating_System
.	O
</s>
<s>
(	O
Cairo	B-Language
Composite	O
Manager	O
)	O
—	O
a	O
compositing	O
add-on	O
for	O
existing	O
window	B-Application
managers	I-Application
.	O
</s>
<s>
It	O
uses	O
Cairo	B-Language
,	O
a	O
vector	O
graphics	O
library	O
also	O
used	O
in	O
GTK+	B-Application
.	O
</s>
<s>
—	O
a	O
compositing	B-Operating_System
manager	I-Operating_System
which	O
can	O
be	O
used	O
along	O
with	O
an	O
existing	O
window	B-Application
manager	I-Application
.	O
</s>
<s>
It	O
uses	O
the	O
XCB	B-Language
library	O
.	O
</s>
<s>
MCompositor	O
—	O
used	O
on	O
MeeGo	B-Operating_System
handsets	O
.	O
</s>
