INT 2F - MediaVision MVSOUND.SYS - RE-INITIALIZE INT 09 HANDLER                 
	AX = BC0Eh
Return: BX = status
	    0000h on failure
		AX = 0000h
	    FFFFh if successful
		DX:AX -> prior INT 09 handler
Desc:	re-initialize INT 09 handler to re-enable hotkeys (e.g. after loading
	  KEYB)