Sequential batch processing: XRST, GN loop, periodic CHKP, final CHKP. - Online inquiry: GU IO-PCB, GU DB-PCB, GNP loop, ISRT IO-PCB. - Online update: GU IO-PCB, GHU DB-PCB, modify, REPL, ISRT IO-PCB. - Cross-database operations use separate PCBs with independent positions.