If you've got multiple windows or dialog boxes open within the same program, and one vanishes from sight, press [Alt] + [F6] to cycle through them until you find the one you want. This doesn't work in Vista; instead, use [Ctrl] + [Shift] + [Tab].
17. Wot no mouse?
Use the [Tab] and [Shift]+[Tab] combo to move between controls in a dialog box, then press [Space] to tick/untick or select the currently highlighted item. Press [Enter] to click OK, or [Esc] to click Cancel.
18. Switch on MouseKeys
Another way to bypass the mouse is to switch on MouseKeys - do so by holding the [Alt], left [Shift] and [NumLock] keys together.
19. Accessibility Options
Press the [Shift] key five times in a row to switch StickyKeys on or off; hold the right [Shift] key for five seconds to enable or disable FilterKeys. Switch ToggleKeys on or off by holding [NumLock] for eight seconds.
20. Use the [Alt] key
If a menu item doesn't have a shortcut assigned to it, use the [Alt] key instead - press [Alt] plus the underlined letter of a menu name to open that menu, then look for an underlined letter on the menu item you want. For example, to save a web page in Internet Explorer, press [Alt] + [F] + [A] to open the Save as dialog.