Virtual Terminal Pools

A set of virtual terminals is called a virtual terminal pool. Each pool specifies the virtual terminals that make up the pool and describes the characteristics of the applications that will use the pool.

After you have defined virtual terminals to VTAM®, as explained in Virtual Terminals, you can either select a predefined virtual terminal pool or you can use the VSM command to define a new virtual terminal pool or modify an existing pool. You can also select virtual terminal pools dynamically at session initiation time.

When you define an application session, you specify a virtual terminal pool that matches the target application's expectations and behavior. When a user starts a session with the application, CL/SuperSession selects a virtual terminal from the pool that you specified.

Use the VSM Command to define virtual terminal pools to CL/SuperSession. Use APPLDEF commands and session profiles to associate pools with applications. Be sure to specify a virtual terminal pool in a multisession or single session application definition. Do not specify a virtual terminal pool for CLSDST PASS application definitions.

Topics discussed in this chapter are

• selecting predefined pools
• defining a new virtual terminal pool
• defining the logmode table entry
• virtual terminal sharing
• TSO considerations
• CICS considerations
• how virtual terminals are selected from virtual terminal pools
• selecting a virtual terminal pool dynamically
• assigning specific virtual terminals within a pool
• defining virtual terminals dynamically
• deleting virtual terminal information
• displaying session information for a virtual terminal