We have been using VTAM/SWITCH from MacKinney Systems for over 20 years. We use the VM version that is no longer supported but it works so we're sticking with it. It runs in GCS. Users can access multiple sessions on VM or VSE. I believe if you used the VSE version that you could still access VM if you have VM/VTAM. The price was quite reasonable as all MacKinney products are.
~ Fran Hensler at Slippery Rock University of Pennsylvania USA for 46 years
VTAM session manager
Keeps z/OS and VSE users from wasting time logging on and
off of different VTAM applications. With VTAM/Switch users can
switch between multiple VTAM sessions (CICS, TSO, ICCF, IMS, TESTCICS,
etc.) by either pressing a PF/PA key or by entering a special two
position character string in conjunction with a PF key (even one
reserved by an application). Multiple VTAM sessions of the same
application are also allowed. Your users can have as many sessions as
you are willing to give them. For instance, programmers can have
multiple sessions in CICS and in their text
VTAM/Switch operates as a standard multiple VTAM sessions application for z/OS and VSE. Under z/OS, it runs in its own address space. Under VSE, it runs in its own partition (including dynamic partitions).
Easy to Install
A pre-generated 'EASY INSTALL' version is supplied and installs in minutes.
Easy to Use
Many session managers require initial entry schemes. The user must enter a signon and password. Then the user must select the various applications. Not with VTAM/Switch. It can be set up so the only thing the users have to know is the PF/PA key to switch sessions. Users need not know that VTAM/Switch even exists, just that they 'suddenly' have the ability to run multiple VTAM sessions, do screen prints and receive messages from a central administrator.
Predefined LOGON procedures can be set up for each user or for groups of users. Users who currently do not signon can be defined so they are automatically signed on to VTAM/Switch and preset VTAM applications when VTAM/Switch is activated (for example users can automatically have multiple CICS sessions available without having to go through LOGON procedures). VTAM/Switch can be transparent to the point that users are never required to see a VTAM/Switch menu. If you wish, some or all users can be given the ability to sign on to VTAM/Switch and LOGON to various VTAM applications.