INT 67,52 - Get/Set Handle Attributes (LIM EMS 4.0+)

	AH = 52h
	AL = 00  get handle attributes
	     01  set handle attributes
	     02  get attribute capability
	BL = new attribute (if AL=1)
	DX = EMM handle


	on return:
	AH = 00  success
	   = error code (see EMS STATUS)
	AL = attribute (input AL=0)
	     00  handle is volatile
	     01  handle is nonvolatile
	AL = attribute capability (input AL=2)
	     00  only volatile handles supported
	     01  both volatile and nonvolatile supported