HELPLIB.HLB  —  MAIL Routines, MAIL$MAILFILE_COMPRESS, Output Item Code
 MAIL$_MAILFILE_RESULTSPEC

    When you specify MAIL$_MAILFILE_RESULTSPEC, the Mail utility
    returns the resultant mail file specification. The buffer address
    field of the item descriptor points to a buffer that receives a
    character string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.
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