/sys$common/syshlp/helplib.hlb RMS, RMS Control Block Macros, $XABDAT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The $XABDAT macro allocates and initializes a XABDAT. No value is
    returned for this assembly-time operation.

    Format

      $XABDAT  EDT=date-time,

               NXT=next-xab-address