> If there are  servers which host a  list, but they are  not peered, and
> both lists are "global", what problems can arise?
 
LISTSERV will tell you  there are several lists by the  same name, and it
can't choose  for you;  instead it  will give  you a  list of  them, with
instructions  to  resend to  the  one  you like  best.  If  you send  the
subscription request  to the  server hosting  one of  the lists,  it will
subscribe you to the local one.
 
> Also, if  two servers define  a list with  the same List-Id,  again not
> peered, and both "global", what problems can that cause?
 
Same as above :-)
 
> I wasn't suggesting  that Listserv should handle  things differently. I
> was just pointing  out that if many non-peered lists  are created, then
> Listserv can't possibly distribute the subscriptions effectively, since
> they appear to be independent lists.
 
I know, it is happening with the LSTSRV-L list because the postmasters at
the former EARN sites aren't deleting the lists... *sigh*
 
  Eric