)
Call the XMS driver "Release upper memory block" function with:
	AH = 11h
	DX = segment address of UMB to release
Return: AX = status
	    0001h success
	    0000h failure
		BL = error code (80h,B2h) (see #02775)
Note:	the XMS driver need not implement functions 10h through 12h to be
	  considered compliant with the standard
SeeAlso: #02760,#02766,#02768