Art,
Try the following:

1. create the following command file and save it as 'xeqtell.cmd.sys' or
whichever name you prefer.

  setjcw cierror=0
  tell !hpjobname,!hpuser.!hpaccount Hi

2. On your 'logon' udc do the following
  ...
  if hpjobtype = "S" then
    xeqtell.cmd.sys > $null
    if cierror <> 1620  then
      echo ****
      echo Multiple logons are not allowed..
      echo ****
      continue
      bye
    endif
  endif
  ...
  ...

  If you do not mind the display:
  "The sender is the only qualifying target.  No message sent. (CIWARN 1620)"
  Then you can imbed the command file into the logon udc.

  Regards

  Paul H. Christidis

  ______________________________ Reply Separator
  _________________________________
Subject: Limiting User logon
Author:  Art Bahrs <[log in to unmask]> at CCGATE
Date:    04/01/97 10:51 AM


Hi all :)

    I can't remember if this one was covered the last time user logon limiting
methodologies were covered... so sorry if I missed the answer.

     Using only MPE/iX 5.0 FOS can you restrict a user to only one logon at a
time... ie so Joe.anyacct can only be logged on to one terminal/device at a
time??

Thanks for any help
Art Bahrs