&ZMREQID

(Message profile variable) If &ZINTYPE=REQ (that is, &INTREAD is satisfied by a request message), this variable is set to either of the following:

The user ID for the user issuing the INTQ command that generated the request message, or
The NCL ID for the NCL process that issued the INTQ command or &WRITE verb.

&ZMREQID depends on &ZINTYPE for its relevance; its setting is categorized by the &ZMREQSRC variable.

Note: &ZMREQID is available for &INTREAD only.