) Call NESL function DeRegisterEventConsumer with: BX = 0005h ES:SI -> CECB previously passed to RegisterEventConsumer (see #03022) Return: AX = completion code (0h, 8002h, 8008h) (see #03019) ES:SI -> still points to CECB BP,DS,STACK preserved Desc: Allows a module to de-register as a consumer of a given event class SeeAlso: #03015,#03017