When a conversation request, represented as an FMH-5, is received, VTAM® notifies the application program of the request. Application programs can use either of the following methods for receiving notification of the receipt of an FMH-5:

• If an ATTN exit is provided, VTAM schedules it when an FMH-5 is received.
• When an APPCCMD macroinstruction completes, VTAM sets a feedback field in the RPL extension to indicate that an FMH-5 is outstanding.

The system programmer can best determine the method to use. Application programs also can maintain an internal timer and issue a macroinstruction at regular intervals to receive FMH-5s that are outstanding.