The Alt and F10 keys are special keys that have special meaning to the Windows operating system. If you press these keys while running an event-based program that displays your keystrokes, you’ll notice that the LastKey property reports a value of "System".
In fact, if you press any keyboard key while the Alt key is held down, the LastKey property also reports an event value of "System". If you press F10, the Windows operating system interprets the next key as a menu shortcut (that's why the value is System. For example, in most applications, if you press F10 followed by the F key, the File menu is pulled down.
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