<s>
Excalibur	B-Protocol
BBS	I-Protocol
was	O
a	O
Windows-based	O
GUI	B-Application
BBS	B-Application
software	O
developed	O
by	O
Excalibur	O
Communications	O
.	O
</s>
<s>
Users	O
connected	O
to	O
the	O
BBS	B-Application
by	O
modem	B-Application
or	O
over	O
a	O
TCP/IP	B-Protocol
connection	O
with	O
the	O
Excalibur	O
Client	O
.	O
</s>
<s>
For	O
its	O
time	O
,	O
the	O
client	O
provided	O
a	O
rich	O
graphical	B-Application
environment	I-Application
allowing	O
users	O
access	O
to	O
instant	B-Application
messaging	I-Application
,	O
games	O
,	O
music	O
,	O
message	B-Application
boards	I-Application
,	O
and	O
web	O
like	O
hyperlinked	O
navigation	O
screens	O
.	O
</s>
<s>
Due	O
to	O
programming	O
limitations	O
,	O
Excalibur	B-Protocol
BBS	I-Protocol
does	O
not	O
work	O
properly	O
on	O
Windows	B-Application
XP	I-Application
or	O
newer	O
.	O
</s>
<s>
The	O
original	O
program	O
was	O
written	O
in	O
Borland	B-Application
C++	I-Application
by	O
Tim	O
Robinson	O
.	O
</s>
