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	CloseDevice - terminates access to the narrator device

	CloseDevice(IORequest)
		       A1

	Close invalidates the IO_UNIT and IO_DEVICE fields in the
	IORequest block, preventing subsequent IO until another
	OpenDevice.  CloseDevice also reduces the open count.  If 
	the count goes to 0 and the expunge bit is set, the device
	is expunged.  If the open count goes to zero and the delayed
	expunge bit is not set, CloseDevice sets the expunge bit.

	A valid IORequest block with its io_Message structure, and
	io_Device and io_Unit fields properly initialized.  These
	fields are initialized by OpenDevice.

	CloseDevice invalidates the unit and device pointers in the
	IORequest block.