<s>
Internet	B-Protocol
Citizen	I-Protocol
's	I-Protocol
Band	I-Protocol
(	O
better	O
known	O
as	O
ICB	O
)	O
is	O
an	O
early	O
Internet	B-Protocol
chat	I-Protocol
program	O
and	O
its	O
associated	O
protocol	O
.	O
</s>
<s>
ICB	O
is	O
typically	O
served	O
on	O
port	B-Protocol
7326	O
.	O
</s>
<s>
Fn	O
,	O
based	O
on	O
a	O
MUD	B-Application
software	O
program	O
by	O
Casey	O
,	O
established	O
the	O
protocol	O
and	O
clients	O
.	O
</s>
<s>
ICB	O
features	O
many	O
standard	O
chat	B-Protocol
program	I-Protocol
functions	O
,	O
including	O
channels	O
,	O
private	O
messages	O
,	O
and	O
nickname	O
registration	O
.	O
</s>
<s>
Most	O
of	O
the	O
common	O
clients	O
support	O
TCL	B-Operating_System
scripting	O
of	O
commands	O
and	O
functions	O
.	O
</s>
<s>
Some	O
clients	O
(	O
principally	O
icbm	O
)	O
support	O
scripting	O
in	O
Perl	B-Language
instead	O
.	O
</s>
<s>
ICB	O
has	O
never	O
supported	O
multi-server	O
shared	O
groups	O
,	O
so	O
the	O
number	O
of	O
simultaneous	O
users	O
has	O
always	O
been	O
somewhat	O
limited	O
in	O
comparison	O
to	O
more	O
popular	O
chat	B-Protocol
programs	I-Protocol
.	O
</s>
<s>
ICB	O
does	O
not	O
support	O
transferring	O
files	O
or	O
multimedia	O
via	O
the	O
chat	B-Protocol
program	I-Protocol
.	O
</s>
