/sys$common/syshlp/HELPLIB.HLB  —  MAIL Routines, MAIL$MESSAGE_MODIFY, Output Item Code
 MAIL$_MESSAGE_CURRENT_ID

    When you specify MAIL$_MESSAGE_CURRENT_ID, MAIL$MESSAGE_MODIFY
    returns the message identification number of the current message.
    The buffer address field of the item descriptor points to a
    longword that receives the message identification number.
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