INT 67,43 - Get Handle and Allocate Pages (LIM EMS 3.2+)

	AH = 43h
	BX = number of logical pages to allocate

	on return:
	AH = 00  success
	   = error code (see EMS STATUS)
	DX = EMM handle

	- handles not explicitly closed by the application are not
	  recoverable on exit from the program
	- registers not listed are preserved