<s>
ToolTalk	B-Operating_System
is	O
an	O
interapplication	B-Operating_System
communications	I-Operating_System
system	O
developed	O
by	O
Sun	O
Microsystems	O
(	O
SunSoft	O
)	O
in	O
order	O
to	O
allow	O
applications	O
to	O
communicate	O
with	O
each	O
other	O
at	O
runtime	O
.	O
</s>
<s>
Applications	O
supporting	O
ToolTalk	B-Operating_System
can	O
construct	O
"	O
high-level	O
"	O
messages	O
and	O
hand	O
them	O
off	O
to	O
the	O
system	O
's	O
ToolTalk	B-Operating_System
server	O
,	O
which	O
determines	O
the	O
proper	O
recipients	O
and	O
(	O
after	O
applying	O
permission	O
checks	O
)	O
forwards	O
the	O
message	O
to	O
them	O
.	O
</s>
<s>
Although	O
originally	O
available	O
only	O
on	O
SunOS	B-Operating_System
and	O
Solaris	B-Application
,	O
ToolTalk	B-Operating_System
was	O
chosen	O
as	O
the	O
application	O
framework	O
for	O
the	O
Common	B-Application
Desktop	I-Application
Environment	I-Application
(	O
CDE	O
)	O
and	O
thus	O
became	O
part	O
of	O
a	O
number	O
of	O
Unix	B-Application
distributions	O
as	O
well	O
as	O
OpenVMS	B-Operating_System
.	O
</s>
<s>
While	O
ToolTalk	B-Operating_System
had	O
"	O
object	O
oriented	O
"	O
and	O
"	O
procedural	O
"	O
messages	O
and	O
a	O
complex	O
"	O
pattern	O
"	O
structure	O
which	O
allowed	O
dispatch	O
of	O
messages	O
to	O
processes	O
based	O
on	O
object	O
names	O
,	O
message	O
names	O
,	O
and	O
parameter	O
types	O
,	O
actual	O
desktop	O
protocols	O
never	O
took	O
full	O
advantage	O
of	O
its	O
power	O
.	O
</s>
<s>
Simpler	O
pattern-matching	O
systems	O
like	O
Apple	O
Computer	O
's	O
AppleScript	B-Application
system	O
did	O
just	O
as	O
well	O
.	O
</s>
<s>
The	O
D-Bus	B-Language
standard	O
has	O
superseded	O
ToolTalk	B-Operating_System
in	O
some	O
Unix-like	O
desktop	O
environments	O
.	O
</s>
