PROCEDURE NEWLNK;
   EXTERNAL;
{*USER*
 
This procedure processes net link requests. Called from DoMail, it determines
if a slot is available, and either accepts (and initializes) the link for
that slot, or rejects the link if none is available.
 
A future version will employ least-recently-used techniques to always
accept a (non-duplicating) link by dropping a 'stale' link when necessary.
This version simply rejects the request.
 
Note that one link per remote node/router pair is required for all message
traffic. This procedure will reject a link request for which an active link
exists.
 }