The $XABPRO_STORE macro moves user-specified values into fields
    of the specified XABPRO. The expanded $XABPRO_STORE code executes
    at run time on a previously initialized (allocated) XABPRO, in
    contrast to the $XABPRO macro, which initializes a XABPRO at
    assembly time. The $XABPRO_STORE macro must reside in a code
    program section.

    Format

      $XABPRO_STORE  XAB=xabpro-address,

                     ACLBUF=ACL-buffer-address,

                     ACLCTX=#<ACL-context>,

                     ACLSIZ=#ACL-buffer-size,

                     MTACC=#magnetic-tape-accessibility,

                     NXT=next-xab-address,

                     PRO=<system, owner, group, world>,

                     PROT_OPT=<PROPAGATE>,

                     UIC=#uic-value