MACRO -- $ASXB -- OS ADDRESS SPACE CONTROL BLOCK DSECT
         $ASXB &LIST=,&DOC=NO,&DSECT=YES
         TITLE 'OS ADDRESS SPACE CONTROL BLOCK (ASXB) DSECT'
         IHAASXB DSECT=&DSECT
&SYSECT  CSECT                     END OF ASXB DSECT
         MEND