Microsoft actually built a multi-touch mouse before Apple; at CES last year Stephen Bathiche, the head of the Microsoft Applied Sciences team, told TechRadar how his team designed a capacitive mouse and announced their research prototype at a conference a month before Apple announced the Magic Mouse.The touch interface reacts to touches. It is possible for instance to left-click and right-click by taping the finger in the right locations on the mouse surface. Microsoft states that it can do everything that a normal mouse can do which would indicate that there should be an emulation of a middle-mouse button as well.
*i.imgur.com/Qy5xm.jpg
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*i.imgur.com/Qy5xm.jpg
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