F1 - brings up a help file (games and OS, Operating System).
F2 - Game navigation or weapon loading (as it is designated).
F3 - brings up previous DOS commands as typed, for old timers) also see F2.
F4 - as above.
F5 - refresh Windows dialog windows.
F6 - F12 (try 'em out).
WINDOWS SHORTCUTS
Ctrl+T -- opens a new tab in all major Web browsers.
Alt+Tab -- cycles through currently-open programs. If you also hold down Shift, it cycles backwards.
Ctrl+Tab -- cycles through Web browser tabs (you can use Shift to go backwards too).
Ctrl+W -- closes the current window or tab. Some applications can be closed with Ctrl+W, but Alt+F4 is universal.
Ctrl+C and Ctrl+V -- copies selected text (you can use Shift and arrow keys to select text!), and then paste it. Use Alt-Tab to switch between source and destination for bonus points.
Ctrl+Z -- undoes your last action. This works in almost everything except Web browsers. 'Redo' varies from program to program (check the 'Edit' menu to find out!)
Ctrl+Mouse scroll wheel -- zoom in, zoom out. This works in almost every kind of app, including Web browsers. Great for increasing the size of tiny 'aesthetic' text on normal websites... or tiny thumbnails on nefarious ones. Also scales the size of icons on your desktop, if they're too small for you!
F5 -- refreshes your current folder/directory or Web page. Yes, you can hammer a button on your keyboard rather than foolishly clicking a button over and over!
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Alt+D -- selects the address bar in your Web browser or folder/directory view! Yes, I know -- how awesome is that?
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Really Neat Keyboard Shortcuts
This next block of shortcuts is for the power users, the administrators, those of you that want to squeeze just a little bit more out of your PC. These shortcuts are nearly all Windows Key combinations, so first... a little bit of trivia (you never know when you might get asked about the Windows Key in a pub quiz!).
The Windows Key (the one with the flag on, next to 'Ctrl' and 'Alt') is a relatively recent addition to modern keyboards. It's functionally identical to the Mac's Command Key, and both of them originated on the awesomely-named 'Space-cadet keyboard' at MIT. Along with its bastard cousin the 'menu key' (I can only assume that key was thrown in for special people with one-button mouses), it started to appear after Windows 95 was released. And now on with the shortcuts!
Windows Key+L -- locks the computer! BLAM! It's really fast and probably the best (and most secure) way to quickly clear your screen of anything offensive.
Windows Key+D -- shows your desktop. Hit Windows Key+D again to bring the windows back! Another great way to hide whatever you're up to -- or maybe you just want to declutter your workspace.
Windows Key -- pops up the Start Menu. It also focuses the 'instant search/run' box, so you can start typing immediately. Type the name of an application and press enter! Windows Key+R is the same thing but without the as-you-type search.
Windows Key+Number (0 through 9) -- opens the program pinned to your Superbar/taskbar as indicated by the number. Windows Key+1 would be the first icon on your taskbar... +5 the fifth, and so on. If the program is already open, you switch focus to that window. Shift+Windows
Key+Number opens a new instance of the pinned program.
Windows Key+Tab -- a pretty, Aero Flip version of Alt+Tab. Cycle through your open applications in 3D! This can be quite slow on laptops or older PCs.
Windows Key+Shift+Left Arrow -- on multi-monitor setups, this moves your current window to the left-hand screen. +Right Arrow would move it to the right. If you only have two screens it doesn't matter which combo you use.
Note: these shortcuts all work with Windows 7; most of them work with Vista -- and only some work with XP and earlier.
Left Alt+Left Shift+Print Screen (PrtScrn) -- changes Windows to 'high contrast' settings. Good for Web sites that all 'fade into grey' -- or for older people with weaker eyes!
Ctrl+Shift+Esc -- opens the Task Manager. No, you don't have to access it via Ctrl+Alt+Del!
Ctrl+Alt+Del -- yes... this one reboots your computer. Surprising how rarely you have to hit it nowadays, eh?
Windows Key, Right, Right -- no, not a cheat code! This brings you to the Log Off/Shut Down/Sleep menu.
Ctrl+Right Arrow (or Left Arrow) -- when word processing, this moves the cursor one word tothe left or right. Much faster than simply 'holding down the arrow key'. If you hold down Shift you also select the text as you go; very cool.
If you right-click the address bar, there are options to try.
;-)