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Try all the mouse buttons in different regions (terminal,
background, task bar).
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Explore the menus.
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Customize your terminal window.
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Use the mouse buttons to copy and paste text from one terminal
to another.
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Find out how to configure your window manager; try different
workspaces (virtual screens).
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Add an applet, such as a load monitor, to the task bar.
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Apply a different theme.
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Enable the so-called sloppy focus - this is when a
window is activated by just moving the mouse over it, so that you
do not need to click the window in order to be able to use it.
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Switch to a different window manager.
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Log out and select a different session type, like KDE if you
were using Gnome before. Repeat the previous steps.