<s>
BitlBee	B-Protocol
is	O
a	O
cross-platform	B-Operating_System
IRC	B-Protocol
instant	B-Application
messaging	I-Application
gateway	B-Application
,	O
licensed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
BitlBee	B-Protocol
communicates	O
with	O
the	O
user	O
via	O
the	O
IRC	B-Protocol
protocol	O
,	O
providing	O
a	O
gateway	B-Application
to	O
popular	O
chat	O
networks	O
such	O
as	O
AIM	B-Protocol
and	O
ICQ	B-Protocol
(	O
via	O
OSCAR	B-Application
)	O
,	O
Microsoft	O
Messenger	B-Protocol
service	O
(	O
via	O
MSNP	B-General_Concept
)	O
,	O
Yahoo	B-Application
!	I-Application
</s>
<s>
(	O
via	O
YMSG	B-Application
)	O
and	O
Facebook	B-Protocol
Messenger	I-Protocol
(	O
via	O
MQTT	B-Application
with	O
a	O
plugin	O
)	O
and	O
the	O
microblogging	O
networks	O
Twitter	B-Application
,	O
Identi.ca,	O
and	O
GNU	B-Protocol
Social	I-Protocol
.	O
</s>
<s>
Since	O
version	O
3.0	O
,	O
BitlBee	B-Protocol
can	O
be	O
built	O
to	O
use	O
the	O
libpurple	B-Protocol
library	O
,	O
which	O
supports	O
file	O
transfers	O
on	O
many	O
IM	O
networks	O
,	O
and	O
supports	O
GaduGadu	O
,	O
QQ	O
and	O
other	O
less	O
well-known	O
protocols	O
.	O
</s>
<s>
Off-the-record	B-Protocol
messaging	I-Protocol
is	O
supported	O
by	O
Bitlbee	B-Protocol
.	O
</s>
<s>
It	O
supports	O
the	O
display	O
of	O
remote	O
user	O
status	O
using	O
the	O
IRC	B-Protocol
voice	O
attribute	O
:	O
online	O
users	O
are	O
shown	O
with	O
voice	O
,	O
away	O
users	O
are	O
shown	O
without	O
.	O
</s>
<s>
Many	O
IRC	B-Protocol
commands	O
such	O
as	O
/WHO	O
and	O
/QUERY	O
are	O
available	O
,	O
though	O
the	O
capabilities	O
of	O
the	O
remote	O
IM	O
protocols	O
limit	O
which	O
IRC	B-Protocol
commands	O
will	O
work	O
.	O
</s>
<s>
It	O
can	O
be	O
installed	O
and	O
operated	O
on	O
a	O
user	O
's	O
personal	O
computer	O
,	O
a	O
local	O
server	O
,	O
or	O
accessed	O
on	O
public	O
gateway	B-Application
servers	O
.	O
</s>
<s>
A	O
user	O
registers	O
with	O
the	O
BitlBee	B-Protocol
server	O
for	O
future	O
credentials	O
storage	O
.	O
</s>
<s>
Service	O
protocols	O
are	O
added	O
along	O
with	O
their	O
credentials	O
;	O
following	O
this	O
,	O
the	O
software	O
will	O
display	O
the	O
user	O
's	O
buddy	O
list	O
as	O
normal	O
IRC	B-Protocol
users	O
in	O
a	O
channel	O
.	O
</s>
<s>
Conversations	O
can	O
be	O
public	O
,	O
or	O
use	O
the	O
private	O
message	O
facility	O
of	O
IRC	B-Protocol
.	O
</s>
<s>
BitlBee	B-Protocol
runs	O
on	O
Linux	B-Application
,	O
Unix	B-Application
,	O
BSD	B-Operating_System
,	O
Windows	B-Application
,	O
AmigaOS	B-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
