)
Call the XMS driver "Lock extended memory block" function with:
AH = 0Ch
DX = handle of block to lock
Return: AX = status
0001h success
DX:BX = 32-bit physical address of locked block
0000h failure
BL = error code (80h,81h,A2h,ACh,ADh) (see #02775)
Note: MS Windows 3.x rejects this function for handles allocated after
Windows started
SeeAlso: #02759,#02761,#02763,#02777