<s>
Cygwin/X	B-Application
is	O
an	O
implementation	O
of	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
that	O
runs	O
under	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
is	O
part	O
of	O
the	O
Cygwin	B-Language
project	O
,	O
and	O
is	O
installed	O
using	O
Cygwin	B-Language
's	O
standard	O
setup	O
system	O
.	O
</s>
<s>
Cygwin/X	B-Application
is	O
free	B-Application
software	I-Application
,	O
licensed	O
under	O
the	O
X11	B-License
License	I-License
.	O
</s>
<s>
Cygwin/X	B-Application
was	O
originally	O
based	O
on	O
XFree86	B-Device
,	O
but	O
switched	O
to	O
the	O
X.Org	B-Operating_System
Server	I-Operating_System
due	O
to	O
XFree86	B-Device
licensing	O
controversy	O
,	O
owing	O
to	O
concerns	O
over	O
XFree86	B-Device
's	O
new	O
software	B-License
license	I-License
not	O
being	O
compatible	O
with	O
the	O
GPL	O
.	O
</s>
<s>
After	O
a	O
long	O
hiatus	O
following	O
an	O
8	O
July	O
2005	O
release	O
,	O
the	O
project	O
was	O
revitalised	O
and	O
the	O
developers	O
released	O
a	O
version	O
based	O
on	O
the	O
X.org	O
modular	O
7.4	O
release	O
on	O
12	O
November	O
2008	O
and	O
continue	O
to	O
maintain	O
it	O
.	O
</s>
<s>
There	O
are	O
two	O
ways	O
to	O
run	O
Cygwin/X	B-Application
:	O
</s>
<s>
In	O
one	O
,	O
an	O
X	B-Operating_System
server	O
runs	O
in	O
a	O
single	O
Microsoft	B-Application
Windows	I-Application
window	O
that	O
serves	O
as	O
the	O
X	B-Operating_System
display	O
,	O
which	O
holds	O
the	O
X	B-Operating_System
root	B-Device
window	I-Device
and	O
all	O
the	O
other	O
X	B-Operating_System
windows	I-Operating_System
in	O
the	O
X	B-Operating_System
session	O
.	O
</s>
<s>
You	O
use	O
an	O
X	B-Operating_System
window	I-Operating_System
manager	O
to	O
manage	O
the	O
X	B-Operating_System
windows	I-Operating_System
within	O
the	O
display	O
.	O
</s>
<s>
You	O
can	O
run	O
multiple	O
X	B-Operating_System
servers	I-Operating_System
,	O
each	O
in	O
its	O
own	O
Microsoft	B-Application
Windows	I-Application
window	O
.	O
</s>
<s>
The	O
other	O
method	O
is	O
to	O
run	O
Cygwin/X	B-Application
rootless	O
.	O
</s>
<s>
In	O
this	O
method	O
,	O
each	O
X	B-Operating_System
window	I-Operating_System
corresponds	O
with	O
its	O
own	O
Microsoft	B-Application
Windows	I-Application
window	O
and	O
there	O
is	O
no	O
root	B-Device
window	I-Device
.	O
</s>
<s>
There	O
is	O
no	O
X	B-Operating_System
window	I-Operating_System
manager	O
;	O
Microsoft	B-Application
Windows	I-Application
 '	O
window	O
manager	O
moves	O
,	O
resizes	O
,	O
hides	O
,	O
etc	O
.	O
</s>
<s>
the	O
X	B-Operating_System
windows	I-Operating_System
.	O
</s>
<s>
One	O
use	O
for	O
Cygwin/X	B-Application
is	O
to	O
provide	O
a	O
graphical	O
interface	O
for	O
applications	O
running	O
on	O
the	O
same	O
computer	O
with	O
Cygwin/X	B-Application
which	O
are	O
designed	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Such	O
an	O
application	O
is	O
probably	O
running	O
under	O
Cygwin	B-Language
.	O
</s>
<s>
Another	O
use	O
for	O
Cygwin/X	B-Application
is	O
as	O
an	O
X	B-Operating_System
terminal	O
:	O
applications	O
running	O
on	O
another	O
computer	O
access	O
the	O
Cygwin/X	B-Application
X	B-Operating_System
server	O
via	O
the	O
X	B-Operating_System
protocol	O
over	O
an	O
IP	B-Protocol
network	O
.	O
</s>
<s>
One	O
can	O
run	O
XDM	O
on	O
the	O
remote	O
system	O
so	O
that	O
a	O
user	O
can	O
log	O
into	O
the	O
remote	O
computer	O
via	O
a	O
window	O
on	O
the	O
Cygwin/X	B-Application
system	O
and	O
then	O
the	O
remote	O
system	O
puts	O
up	O
web	O
browsers	O
,	O
terminal	O
windows	O
,	O
and	O
the	O
like	O
on	O
the	O
Cygwin/X	B-Application
display	O
.	O
</s>
<s>
Another	O
common	O
way	O
for	O
an	O
application	O
on	O
a	O
remote	O
system	O
to	O
operate	O
through	O
a	O
window	O
on	O
a	O
local	O
Cygwin/X	B-Application
display	O
is	O
SSH	O
tunneling	O
.	O
</s>
<s>
An	O
application	O
on	O
the	O
local	O
system	O
creates	O
an	O
SSH	O
session	O
on	O
the	O
remote	O
system	O
(	O
perhaps	O
the	O
application	O
is	O
xterm	B-Language
and	O
the	O
user	O
types	O
an	O
'	O
ssh	O
 '	O
command	O
)	O
.	O
</s>
<s>
The	O
SSH	O
server	O
on	O
the	O
remote	O
system	O
sets	O
things	O
up	O
so	O
that	O
any	O
X	B-Operating_System
client	O
program	O
the	O
shell	O
starts	O
(	O
on	O
the	O
remote	O
system	O
)	O
uses	O
the	O
local	O
Cygwin/X	B-Application
server	O
.	O
</s>
