INT 67,45 - Release Handle and Memory Pages (LIM EMS)

	AH = 45h
	DX = EMM handle

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

	- handles must be explicitly freed by an application or the memory
	  will not be available to the following applications
	- if unsuccessful, the operation should be retried
	- registers not listed are preserved