INT 67,4B - Get Handle Count (LIM EMS)

	AH = 4Bh


	on return:
	AH = 00  success
	   = error code (see EMS STATUS)
	BX = number of currently active EMM handles (0-256)
	     zero indicates EMS not in use


	- to determine the number of handles available subtract BX from 255
	- registers not listed are preserved