<s>
SIO	B-Protocol
is	O
a	O
serial	O
port	O
driver	O
package	O
for	O
OS/2	B-Application
written	O
by	O
Raymond	O
L	O
.	O
Gwinn	O
.	O
</s>
<s>
It	O
is	O
designed	O
to	O
not	O
only	O
improve	O
performance	O
over	O
OS/2	B-Application
'	O
s	O
default	O
serial	O
drivers	O
,	O
but	O
also	O
improve	O
compatibility	O
.	O
</s>
<s>
SIO	B-Protocol
contains	O
a	O
virtualized	O
FOSSIL	B-Protocol
(	O
VX00	O
)	O
driver	O
that	O
can	O
be	O
loaded	O
to	O
provide	O
FOSSIL	B-Protocol
support	O
to	O
DOS	B-Device
based	O
communications	O
software	O
.	O
</s>
<s>
SIO	B-Protocol
later	O
added	O
the	O
ability	O
to	O
create	O
virtualized	O
COM	O
ports	O
,	O
which	O
,	O
combined	O
with	O
the	O
included	O
program	O
VMODEM	O
,	O
allows	O
incoming	O
telnet	B-Protocol
connections	O
to	O
be	O
directed	O
toward	O
the	O
virtualized	O
COM	O
port	O
.	O
</s>
<s>
Older	O
communications	O
software	O
are	O
also	O
able	O
to	O
"	O
call	O
out	O
"	O
to	O
telnet	B-Protocol
sites	O
.	O
</s>
<s>
SIO	B-Protocol
(	O
and	O
the	O
included	O
VMODEM	O
software	O
)	O
became	O
very	O
popular	O
among	O
Bulletin	B-Application
Board	I-Application
System	I-Application
operators	O
due	O
to	O
the	O
incoming	O
telnet	B-Protocol
feature	O
,	O
as	O
well	O
as	O
drastic	O
speed	O
improvements	O
over	O
other	O
telnet	B-Protocol
solutions	O
of	O
the	O
time	O
.	O
</s>
