INT 67 - LIM EMSsee Expanded Memory Specification 4.0 - GET/SET HANDLE ATTRIBUTES
	AH = 52h
	AL = subfunction
	    00h get handle attributes
		Return: AL = attribute
			    00h handle is volatile
			    01h handle is nonvolatile
	    01h set handle attributes
		BL = new attribute
		   00h handle is volatile
		   01h handle is nonvolatile
	    02h get attribute capability
		Return: AL = attribute capability
			    00h only volatile handles supported
			    01h both volatile and non-volatile supported
	DX = handle
Return: AH = status (00h,80h,81h,83h,84h,8Fh-91h) (see #03648)
SeeAlso: AH=53h