SB>
  >                               when I'm in a full screen
  > Win-OS/2 session (in Warp3 that I have) the program can be
  > activated exterally to switch me back to the OS/2
  > Desktop....
SB>

  A Windows program that looks for the `Desktop' window and sends it an
  activate message should do the trick.

  On the other hand, invoking any PM program should also switch you from a
  full-screen Windows VDM back to the PM session.  A convenient `dummy'
  program to use is NOTHING.CMD :

    /* This is a REXX script that does nothing */

  Invoke the PM REXX interpreter to run this as `PMREXX NOTHING.CMD'.

  > JdeBP <
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