.MACRO CALL_WRTMAILBOX SAVE_R1 .GLOBAL EXE_STD$WRTMAILBOX $PUSH64_R1 SAVE_R1 PUSHL R4 PUSHL R3 PUSHL R5 CALLS #3,G^EXE_STD$WRTMAILBOX $POP64_R1 SAVE_R1 .ENDM CALL_WRTMAILBOX