Sessions can be established by an application program running in an address space other than that which opened the application ACB of the program. This enables the application program to be represented to VTAM® by one ACB (that is, APPL definition statement) but span multiple address spaces. The application program can also issue VTAM requests to send and receive data while running in a different address space than the one in which the session was originally established.

For information about enabling an application program to support cross-memory API, see z/OS Communications Server: SNA Programming.