<s>
ircII	B-Protocol
(	O
pronounced	O
i-r-c-two	O
or	O
irk-two	O
,	O
and	O
sometimes	O
referred	O
to	O
as	O
IRC	B-Protocol
client	O
,	O
second	O
edition	O
)	O
is	O
a	O
free	B-Application
,	I-Application
open-source	I-Application
Unix	B-Application
IRC	B-Protocol
and	O
ICB	B-Protocol
client	O
written	O
in	O
C	B-Language
.	O
Initially	O
released	O
in	O
the	O
late	O
1980s	O
,	O
it	O
is	O
the	O
oldest	O
IRC	B-Protocol
client	O
still	O
maintained	O
.	O
</s>
<s>
Several	O
other	O
UNIX	B-Application
IRC	B-Protocol
clients	O
,	O
including	O
BitchX	B-Protocol
,	O
EPIC	O
,	O
and	O
ScrollZ	O
,	O
were	O
originally	O
forks	O
of	O
ircII	B-Protocol
.	O
</s>
<s>
It	O
was	O
the	O
first	O
client	O
to	O
implement	O
file	O
transfer	O
capabilities	O
over	O
IRC	B-Protocol
.	O
</s>
<s>
The	O
DCC	O
protocol	O
was	O
implemented	O
by	O
Troy	O
Rollo	O
in	O
1991	O
for	O
version	O
2.1.2	O
,	O
and	O
was	O
never	O
intended	O
to	O
be	O
portable	O
to	O
other	O
IRC	B-Protocol
clients	O
.	O
</s>
<s>
ircII	B-Protocol
is	O
written	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
and	O
implements	O
a	O
termcap	B-Application
,	O
text-mode	O
,	O
user	O
interface	O
.	O
</s>
<s>
Encrypted	O
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
connections	O
to	O
IRC	B-Protocol
servers	O
are	O
established	O
with	O
the	O
OpenSSL	B-Language
library	O
.	O
</s>
<s>
The	O
concept	O
of	O
file	O
transfers	O
over	O
IRC	B-Protocol
networks	I-Protocol
was	O
first	O
implemented	O
by	O
the	O
authors	O
of	O
ircII	B-Protocol
.	O
</s>
