INT 31 P - DPMI 0.9+ - SET DESCRIPTOR ACCESS RIGHTS
        AX = 0009h
        BX = selector
        CL = access rights/type byte
        CH = 80386 extended rights/type byte (32-bit DPMI implementations only)
Return: CF clear if successful
        CF set on error
            AX = error code (DPMI 1.0+) (8021h,8022h,8025h) (see AX=0000h)
Notes:  if the Present bit is clear, CL bits 0-3 may have any value
        DPMI 1.0+ automatically reloads any segment registers containing the
          selector being modified
        not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0008h,AX=000Ch,INT 21/AX=2514h