INT 67,4C - Get Page Count for Handle (LIM EMS)

	AH = 4Ch
	DX = EMM handle


	on return:
	AH = 00  success
	   = error code (see EMS STATUS)
	BX = total allocated page count for handle (1-512)


	- a handle can refer to up to 512 logical pages
	- registers not listed are preserved