DeviceStatus (PULONG) - input

      Current status flags.

      Address of the current status-flag settings for the installed mouse device driver.

      The return value is a 4-byte set of bit flags.

        Bit

          Description
        31-10
          Reserved. Set to 0.
        9
          If set, mouse data is returned in mickeys, not pels.
        8
          If set, the drawing operations for the pointer draw routine are disabled.
        7-4
          Reserved. Set to 0.
        3
          If set, the pointer draw routine is disabled by an unsupported mode.
        2
          If set, a flush is in progress.
        1
          If set, a block-read is in progress.
        0
          If set, the event queue is busy with I/O.

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