<s>
Its	O
installed	O
based	O
grew	O
very	O
rapidly	O
at	O
first	O
because	O
it	O
was	O
one	O
of	O
the	O
first	O
third	O
party	O
products	O
to	O
be	O
based	O
upon	O
the	O
then	O
advanced	O
networking	O
technology	O
from	O
IBM	O
,	O
known	O
as	O
IBM	B-Protocol
Advanced	I-Protocol
Program-to-Program	I-Protocol
Communication	I-Protocol
,	O
which	O
allowed	O
faster	O
and	O
more	O
reliable	O
communication	O
between	O
different	O
types	O
of	O
computers	O
.	O
</s>
<s>
Its	O
early	O
versions	O
supported	O
IBM	O
mainframe	B-Architecture
and	O
midrange	B-Device
including	O
IBM	O
System	O
38	O
and	O
AS/400	O
,	O
Windows	O
,	O
Apple	O
,	O
UNIX	O
,	O
Digital	O
Equipment	O
Corporation	O
VAX	O
,	O
Data	O
General	O
,	O
Stratus	O
,	O
Tandem	O
,	O
and	O
others	O
,	O
for	O
many	O
decades	O
and	O
functions	O
on	O
both	O
SNA	B-Architecture
and	O
TCP/IP	B-Protocol
networks	I-Protocol
.	O
</s>
