<s>
In	O
computing	O
,	O
User	B-Protocol
Location	I-Protocol
Service	I-Protocol
was	O
a	O
standards-based	O
protocol	O
for	O
directory	O
services	O
and	O
presence	O
information	O
,	O
first	O
submitted	O
as	O
a	O
draft	O
to	O
the	O
IETF	O
in	O
February	O
1996	O
.	O
</s>
<s>
Client	O
software	O
supporting	O
ULS	O
included	O
early	O
versions	O
of	O
Microsoft	B-Protocol
Netmeeting	I-Protocol
,	O
Intel	O
Video	O
Phone	O
and	O
FreeWebFone	O
.	O
</s>
<s>
Netmeeting	B-Protocol
had	O
depreciated	O
ULS	O
in	O
favour	O
of	O
Internet	O
Locator	O
Service	O
by	O
1997	O
and	O
FreeWebFone	O
no	O
longer	O
exists	O
.	O
</s>
<s>
A	O
ULS	B-Protocol
server	I-Protocol
provides	O
directory	O
services	O
and	O
presence	O
lookup	O
for	O
clients	O
.	O
</s>
<s>
At	O
one	O
stage	O
,	O
public	O
ULS	B-Protocol
servers	I-Protocol
were	O
made	O
available	O
by	O
Microsoft	O
and	O
others	O
,	O
but	O
these	O
have	O
largely	O
been	O
abandoned	O
.	O
</s>
<s>
ULS	O
typically	O
runs	O
on	O
the	O
TCP	B-Protocol
port	O
522	O
.	O
</s>
