F1 invokes the Help system. Enter selects a highlighted item. Esc means Cancel. If you selected something by mistake, or you just want "out," press Esc repeatedly until you are in the clear. Left Mouse button (as in click and double click) selects a highlighted item, sizes a window or rectangle, positions the insertion point(5- 1), or begins drag and drop editing. Right Mouse button invokes a speed menu, a short menu with the most popular functions, depending on the context. LeftShift and RightShift are usually but not always equivalent. For example, the left and right shift keys plus Space invoke different dictionary lookup functions.
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