INT 67 - LIM EMS 4.0 - GET/SET HANDLE ATTRIBUTES
        AH = 52h
        AL = subfunction
            00h get handle attributes
                Return: AL = attribute
                            00h handle is volatile
                            01h handle is nonvolatile
            01h set handle attributes
                BL = new attribute (see returned AL)
            02h get attribute capability
                Return: AL = attribute capability
                            00h only volatile handles supported
                            01h both volatile and non-volatile supported
        DX = handle
Return: AH = status (00h,80h,81h,83h,84h,8Fh-91h) (see AH=51h)
SeeAlso: AH=53h

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