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The set of menus described in the previous section pop-up when the mouse cursor is on the root window. There is another set of menus that pop-up when the mouse cursor is on a window and the control key is pressed while a mouse button is being pressed.
Pressing the left mouse button while the cursor is within a window and you are also pressing the control key gives you a menu of Main Options, such as redrawing a window, or sending a kill signal to destroy the window.
Using the middle mouse button with the control key gives you some options for controlling the window you are currently in, such as changing to reverse video, or enabling the visual bell (the window will flash instead of beep when you make an error).
If you press the right mouse button while pressing the control key, you will be given the option of changing the size of the font in the window you are currently in, making it smaller or larger.
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