We already knew that Microsoft would be upgrading its Touch Mouse to support Windows 8 gestures, but the outfit never confirmed which finger movements, exactly, would be built in. Now, Redmond is explaining it all, even though the mouse won't actually get updated until Win8 goes on sale in late October. According to the company, you'll be able to swipe two fingers to the right to toggle between open programs, and two to the left to expose those Charms. Sliding three fingers up and down will allow you to use Semantic Zoom. (Naturally, you'll be able to swipe from side to side to move through the tiles on your Start screen, but you probably already guessed that.) We have a Touch Mouse here at Engadget HQ that we're just itching to update, but until those drivers drop three months from now, it seems we'll just have to find something else to keep us entertained.