sockets on sysVr3

[Guy Harris]

>	You're probably right, they're NOT THERE!  System V (whatever ver)
>has IPC (inter-process communications) calls not sockets

Wrong answer, next contestant please.

S5R4 *does* have the socket calls; they're implemented atop streams and
TLI.  S5R3, as it comes from AT&T, doesn't have sockets, but it does
have streams/TLI, which occupy pretty much the same ecological niche as
sockets.

Many TCP/IP packages for S5R3 come with a sockets emulation library,
although they probably emulate less of the behavior of sockets than does
the S5R4 emulation code.

The IPC calls do *not* occupy the same niche in most systems; they don't
work over networks.