<s>
In	O
computing	O
,	O
an	O
X	B-Protocol
terminal	I-Protocol
is	O
a	O
display/input	O
terminal	B-General_Concept
for	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
client	O
applications	O
.	O
</s>
<s>
X	B-Protocol
terminals	I-Protocol
enjoyed	O
a	O
period	O
of	O
popularity	O
in	O
the	O
early	O
1990s	O
when	O
they	O
offered	O
a	O
lower	O
total	O
cost	O
of	O
ownership	O
alternative	O
to	O
a	O
full	O
Unix	B-Device
workstation	I-Device
.	O
</s>
<s>
An	O
X	B-Protocol
terminal	I-Protocol
runs	O
an	O
'	O
X	B-Operating_System
server	O
 '	O
.	O
</s>
<s>
In	O
X	B-Operating_System
,	O
the	O
usage	O
of	O
"	O
client	O
"	O
and	O
"	O
server	O
"	O
is	O
from	O
the	O
viewpoint	O
of	O
the	O
programs	O
:	O
the	O
X	B-Operating_System
server	O
supplies	O
a	O
screen	O
,	O
keyboard	O
,	O
mouse	O
and	O
touchscreen	O
to	O
client	O
applications	O
.	O
</s>
<s>
This	O
connects	O
to	O
an	O
X	B-Device
display	I-Device
manager	I-Device
(	O
introduced	O
in	O
X11R3	O
)	O
running	O
on	O
a	O
central	O
machine	O
,	O
using	O
XDMCP	O
(	O
X	B-Device
Display	I-Device
Manager	I-Device
Control	O
Protocol	O
,	O
introduced	O
in	O
X11R4	B-Operating_System
)	O
.	O
</s>
<s>
Thin	B-Device
clients	I-Device
have	O
somewhat	O
supplanted	O
X	B-Protocol
terminals	I-Protocol
in	O
that	O
they	O
are	O
equipped	O
with	O
added	O
flash	B-Device
memory	I-Device
and	O
software	O
for	O
communication	O
with	O
remote	B-Protocol
desktop	I-Protocol
protocols	O
.	O
</s>
<s>
In	O
the	O
early	O
1990s	O
,	O
several	O
vendors	O
introduced	O
X	B-Protocol
terminals	I-Protocol
including	O
HP	B-Device
,	O
DEC	O
(	O
including	O
the	O
VT1000	B-Device
series	O
)	O
,	O
IBM	O
,	O
Samsung	B-Application
,	O
NCD	O
,	O
Gipsi	O
and	O
Tektronix	O
.	O
</s>
