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This is the original Microsoft protocol, with a middle-button extension. Some old two-button devices send some spurious packets which can be misunderstood as middle-button events. If this is your case, use the `bare' mouse type. Some new two-button devices are ``plug and play'', and they don't play fair at all; in this case try -t pnp. Many (most) three-button devices that use the microsoft protocol fail to report some middle-button events during mouse motion. Since the protocol does not distinguish between the middle button going up and the middle button going down it would be liable to get out of step, so this decoder declares the middle button to be up whenever the mouse moves. This prevents dragging with the middle button, so you should probably use `-t ms+lr' instead of this decoder, especially if you want to use X. This mouse decoder accepts standard serial options, although they should not be needed.
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