<s>
Xkill	B-Application
is	O
a	O
utility	B-Application
program	I-Application
distributed	O
with	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
that	O
instructs	O
the	O
X	B-Operating_System
server	O
to	O
forcefully	O
terminate	O
its	O
connection	O
to	O
a	O
client	O
,	O
thus	O
"	O
killing	O
"	O
the	O
client	O
.	O
</s>
<s>
Xkill	B-Application
is	O
not	O
intended	O
to	O
be	O
used	O
as	O
a	O
routine	O
way	O
to	O
terminate	O
X	B-Operating_System
client	O
programs	O
,	O
but	O
only	O
as	O
a	O
last	O
resort	O
to	O
abort	O
malfunctioning	O
or	O
malicious	O
clients	O
.	O
</s>
<s>
Unlike	O
kill	O
,	O
xkill	B-Application
does	O
not	O
request	O
that	O
the	O
client	O
process	O
,	O
which	O
may	O
be	O
running	O
on	O
a	O
different	O
machine	O
,	O
be	O
terminated	O
.	O
</s>
<s>
In	O
fact	O
,	O
the	O
process	O
can	O
continue	O
running	O
without	O
an	O
X	B-Operating_System
connection	O
.	O
</s>
<s>
Most	O
clients	O
,	O
however	O
,	O
do	O
abort	O
when	O
their	O
X	B-Operating_System
connections	O
are	O
unexpectedly	O
closed	O
.	O
</s>
<s>
Xkill	B-Application
has	O
been	O
cited	O
as	O
an	O
example	O
of	O
a	O
program	O
with	O
a	O
simple	O
and	O
appealing	O
user	B-Application
interface	I-Application
.	O
</s>
