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It's not that a touch pad doesn't act like a mouse.

It's that a touch pad cannot then act like your finger is on the surface of a touch screen monitor. It's either or.

The bottom or "optical" of the mouse acts like the touch pad surface. The top of the mouse acts like the touch screen.

Try to use the buttons on your touch pad to swipe. Ouch!

I can see how a large enough touch pad could be used to simulate the surface of the touch screen however.