VTAM language

An application program uses VTAM® macroinstructions to request VTAM services. VTAM provides assembler language macroinstructions to:

Associate an application program with or disassociate it from VTAM
Establish and terminate sessions between the application program and specific LUs
Communicate with logical units (LUs)
Build and initialize control blocks used when the application program requests session establishment, communication, or other services from VTAM
Manipulate a control block (for example, to test the value of a field in a control block)
Communicate with the SSCP to perform communication network management (CNM) functions
Transfer VTAM operator commands and messages between an application program and VTAM.

VTAM macroinstructions have the same format as assembler instructions and follow the same rules. See How the macroinstructions are described for coding rules that apply to these instructions.