The Free On-line Dictionary of Computing (30 December 2018):

Terminal Productivity eXecutive
TPX

    (TPX) A multiple session manager used to
   access mainframe applications.  It was written by Morgan
   Stanley, acquired by Duquesne Systems and is now owned by
   Computer Associates.  TPX allows you to work in multiple
   mainframe applications concurrently; lock and unlock your TPX
   screen; place your applications on hold; logon to TPX from a
   different terminal without losing your place; customize your
   TPX menu and send a screen image to another TPX user.

   TPX runs on MVS and VM.  On VM, like VTAM, it uses the
   MVS-like facilities of GCS.  It has a complete scripting
   facility and lets you see other user's sessions.  The
   client-server version allows each managed session to open in
   its own window.  Richard Kuebbing has built a complete e-mail
   system into it.

   Unicenter CA-TPX
   (http://www3.ca.com/Solutions/Product.asp?ID=1531).

   (2005-09-29)