An XA-exploitive  version of LISTSERV  is now available.  XA exploitation
will be  standard in  version 1.8b,  but is being  made available  now to
customer  who  are  storage  constrained.  In  this  first  XA-exploitive
release, the  file I/O buffers  must remain  below the line  because most
versions of  CMS do not  support block I/O  to locations above  the line.
Except for a  few hundred kilobytes of data which  must also remain below
the line for compatibility with locally developed applications, all other
data can  be allocated above  the line. A typical  XA-exploitive LISTSERV
session will have about 10M of free  storage below the line, all of which
can be used for  file I/O buffers and file caching.  If this still proves
too  restrictive, the  file I/O  routines will  be modified  to be  truly
XA-exploitive when running under a version  of CMS which does allow block
I/O above the line.
 
  Eric