Returns the name of the VTAM APPL being used by MAI as the secondary Logical Unit on the session.
Example: &MAILU
&IF &MAILU = MFMST &THEN &GOTO .MASTER
Note: Whenever MAI starts a session, it opens a VTAM ACB whose name is either chosen from a series or is specified by the user or an MAI exit. &MAILU returns the name of the VTAM ACB used for this session.
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