3B1 vs. 7300, uucp/mail Fight, Round One

[thad at cup.portal.com]

A lot of useful suggestions have arrive re: my plight of getting two
systems to each be able to call the other (and avoiding the herald vs.
login "fight").  I intend summarizing all along with a description of
what finally functions.

Among the suggestions:

1) get HDB (aka BNU); the problem has been solved

2) continue with one system as CALLER and the other as HOST, and have the
   CALLER ``poll'' the HOST periodically.

Item (2) seems interesting; how does one ``poll'' the other system in order
for material there destined for the CALLER be transferred?  This requires
more than just a crontab entry which calls the other system, right?