The source code for uucp is availible any number of places; that's probably
the best existing doco. I occasionally have to dust off my ancient UUCP
sk1llz to get files on and off some antique for a client.
BTW...If one wanted to create an out-of-band network, I dunno if I'd pick
UUCP. There are a number of other approaches to doing this out there that
are more functional, more covert and less baroque.
I can almost remember when I was "...!ucbvax!gatech!weasel!ken". Weasel was
a i386sx/20 running SCO Unix in my apartment, and with a 2400 baud dialin, I
was *way* kewler than those BBS weenies. Mail, USENET News and file
transfer...all you really needed. Peter Honeyman was even around to ask
questions, which helped.
Ken Seefried, CISSP