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Get EMB Handle Information (Function 0Eh)

        ARGS:   AH = 0Eh
                DX = Extended memory block handle
        RETS:   AX = 0001h if the block's information is found,
                     0000h otherwise
                BH = The block's lock count
                BL = Number of free EMB handles in the system
                DX = The block's length in K-bytes

        ERRS:   BL = 80h if the function is not implemented
                BL = 81h if a VDISK device is detected
                BL = A2h if the handle is invalid

This function returns additional information about an extended memory
block to the caller.

NOTE: To get the block's base address, use Function 0Ch (Lock Extended
Memory Block).