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Some windows, such as the Source and Assembly windows, allow you to select
text.  For example, you might want to select a variable name or expression.
Menu items will act on the selected item.

You can select text with either the left or right mouse button.  If you use
the right button, the pop-up menu appears when you release the button.  With
the keyboard, hold SHIFT while using the cursor keys.  You can select a
single character and the debugger will automatically extend the selection to
include the entire surrounding word.