<s>
ChitChat	B-Operating_System
was	O
an	O
open-source	B-Application
instant	B-Application
messaging	I-Application
client	B-Protocol
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
supporting	O
the	O
Yahoo	B-Application
!	O
</s>
<s>
It	O
enabled	O
users	O
to	O
chat	O
with	O
each	O
other	O
over	O
the	O
global	O
Yahoo	B-Application
!	O
</s>
<s>
The	O
last	O
version	O
,	O
ChitChat	B-Operating_System
1.2	O
,	O
had	O
a	O
more	O
refined	O
user	O
interface	O
,	O
speed	O
improvements	O
,	O
Address	O
Book	O
support	O
,	O
IM	O
reformatting	O
,	O
an	O
improved	O
events	O
system	O
,	O
and	O
numerous	O
bug	O
fixes	O
.	O
</s>
<s>
ChitChat	B-Operating_System
was	O
programmed	O
in	O
the	O
REALBasic	B-Application
programming	O
environment	O
.	O
</s>
<s>
ChitChat	B-Operating_System
was	O
an	O
offshoot	O
of	O
"	O
miChat	O
!	O
</s>
<s>
"	O
,	O
a	O
Yahoo	B-Application
!	O
</s>
<s>
Chat	O
program	O
for	O
Macintosh	O
computers	O
written	O
by	O
J	O
.	O
Seth	O
Lowe	O
in	O
the	O
REALbasic	B-Application
programming	I-Application
language	I-Application
.	O
</s>
<s>
In	O
late	O
2000	O
,	O
Seth	O
publicly	O
asked	O
for	O
other	O
REALbasic	B-Application
programmers	O
to	O
join	O
the	O
project	O
,	O
in	O
the	O
hope	O
that	O
it	O
would	O
spawn	O
a	O
number	O
of	O
competing	O
Yahoo	B-Application
!	O
</s>
<s>
After	O
collaborating	O
on	O
several	O
features	O
,	O
Seth	O
encouraged	O
him	O
to	O
take	O
free	O
rein	O
in	O
creating	O
his	O
own	O
client	B-Protocol
from	O
the	O
miChat	O
code	O
base	O
.	O
</s>
<s>
The	O
new	O
program	O
,	O
dubbed	O
"	O
ChitChat	B-Operating_System
"	O
,	O
went	O
through	O
several	O
major	O
interface	O
overhauls	O
throughout	O
its	O
existence	O
,	O
seemingly	O
in	O
perpetual	O
beta	O
or	O
pre-release	O
,	O
though	O
it	O
was	O
available	O
publicly	O
.	O
</s>
<s>
Finally	O
,	O
"	O
ChitChat	B-Operating_System
1.0	O
"	O
was	O
released	O
in	O
early	O
2004	O
with	O
versions	O
for	O
Mac	O
OS	O
9	O
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
and	O
Windows	O
98	O
.	O
</s>
<s>
Over	O
the	O
years	O
ChitChat	B-Operating_System
had	O
picked	O
up	O
a	O
rather	O
large	O
feature	O
set	O
.	O
</s>
<s>
In	O
an	O
effort	O
to	O
deflect	O
feature	O
creep	O
without	O
crippling	O
the	O
program	O
,	O
"	O
ChitChat	B-Operating_System
Lite	O
"	O
was	O
introduced	O
in	O
late	O
2005	O
.	O
</s>
<s>
In	O
April	O
2006	O
,	O
Yahoo	B-Application
!	O
</s>
<s>
disconnected	O
their	O
"	O
Java	O
Chat	O
"	O
(	O
known	O
internally	O
as	O
YCHT	O
protocol	O
)	O
in	O
favor	O
of	O
the	O
newer	O
Yahoo	B-Application
!	O
</s>
<s>
Messenger	O
protocol	O
(	O
known	O
as	O
YMSG	B-Application
)	O
.	O
</s>
<s>
ChitChat	B-Operating_System
was	O
designed	O
on	O
this	O
older	O
protocol	O
and	O
would	O
need	O
to	O
be	O
rewritten	O
to	O
support	O
the	O
new	O
system	O
.	O
</s>
<s>
Citing	O
the	O
amount	O
of	O
time	O
and	O
effort	O
a	O
re-write	O
would	O
entail	O
,	O
Tomis	O
announced	O
that	O
ChitChat	B-Operating_System
was	O
effectively	O
terminated	O
.	O
</s>
<s>
During	O
the	O
years	O
that	O
ChitChat	B-Operating_System
was	O
in	O
active	O
development	O
,	O
a	O
new	O
trend	O
in	O
chat	O
clients	O
emerged	O
;	O
that	O
of	O
the	O
multi-client	O
.	O
</s>
<s>
The	O
only	O
multi-client	O
that	O
can	O
connect	O
to	O
Yahoo	B-Application
!	O
</s>
