<s>
The	O
X	B-Device
Display	I-Device
Manager	I-Device
(	O
XDM	B-Language
)	O
is	O
the	O
default	O
display	B-Device
manager	I-Device
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
It	O
is	O
a	O
bare-bones	O
X	B-Device
display	I-Device
manager	I-Device
.	O
</s>
<s>
It	O
was	O
introduced	O
with	O
X11	B-Operating_System
Release	O
3	O
in	O
October	O
1988	O
,	O
to	O
support	O
the	O
standalone	O
X	B-Protocol
terminals	I-Protocol
that	O
were	O
just	O
coming	O
onto	O
the	O
market	O
.	O
</s>
<s>
Because	O
of	O
XDM	B-Language
's	O
minimalism	O
,	O
most	O
desktop	O
environments	O
tend	O
to	O
use	O
later	O
,	O
more	O
sophisticated	O
display	B-Device
managers	I-Device
.	O
</s>
