INT 7F - Alloy MW386 - ENABLE/DISABLE AUTOBAUD DETECT                           
	AH = 3Ch
	AL = new state (00h disabled, 01h enabled)
	DL = user number (FFh = caller)
	DH = machine number for user
Return: CF set if invalid user number
Note:	only available to supervisors
SeeAlso: AH=3Dh