VTAM's receipt of a HALT NET,CANCEL command or a VTAM® abnormal termination also causes entry to the TPEND exit routine. For either event, VTAM interrupts any RPL-based operation and does not complete it (that is, the RPL is not marked as complete and no ECB is posted or RPL exit routine scheduled). VTAM rejects any RPL-based VTAM macroinstruction with (RTNCD,FDB2)=(X'10',X'03') or (X'14,'X'10'). Only CLOSE can be issued. Therefore, when the TPEND exit routine detects code 8 in the parameter list it receives, the exit routine should set a switch or post an ECB to inform the mainline program that it should immediately issue the CLOSE macroinstruction. The exit routine should then return control to VTAM so that control can be given to the mainline program.