Library /sys$common/syshlp/helplib.hlb  —  WRITE  Qualifiers  /WAIT
       /WAIT (default)
       /NOWAIT

    If you specify /NOWAIT, the Put service to a mailbox device uses
    the IO$M_NOW modifier, which causes the operation to complete
    immediately instead of synchronizing with another reader of the
    mailbox.

    Currently this qualifier is supported on Alpha and Integrity
    servers only.
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