Uploaded new version of GameKiller (original thread) which was initially designed to kill the process of the active window (hung games, etc). It was originally made by jalf, but I added some extra features (with his permission, ofc).

The following description is mostly ripped from his post with some additions:

What it does:

Kills the current foreground process (The active window (or fullscreen app), just as if you’d terminated it from the Task Manager.

Makes windowed games (or applications) cover the whole screen, so you can play it virtually in fullscreen and alt+tab without the game minimizing and hanging (and possibly crashing), and IRC on your secondary monitor.

It is also multi-monitor friendly, so your game will fill the monitor that has the greatest area of intersection with the game’s window.

Note: Ack. I noticed there actually was a program that provided this behaviour, however it seems to require configuration for each game/application you use it with, which makes it not as quick and easy to use, IMHO anyway. Oh, well.

What it doesn’t do:

Destroy processes winthin your Windows folder, or a few other select processes (Trillian, Mirc, Visual Studio, 3d Studio Max, Photoshop and one or two others). Didn’t want people to accidentally close programs they actually wanted to run.

How to use:

• Download the app here.
• Run it (you’ll get an indication it is running when the ogre icon is added to the systray).
• Windows Key + Backspace to kill the active process.
• Windows Key + Escape to exit GameKiller.
• Windows Key + Page Down to remove borders and reposition/resize foreground window to fit monitor, i.e. makes your windowed game fullscreen.
• Windows Key + Page Up to revert foreground window to previous settings.

Workarounds:

Some games exclusively capture the keyboard or run under administrator privileges, so I added the following shortcuts to cater to these:

• Windows Key + Shift + Page Down works like Windows Key + Page Down, except it works on the window the mouse is currently above, instead of the active window.
• Windows Key + Shift + Page Up works like Windows Key + Page Up, except it works on the window the mouse is currently above, instead of the active window.
• Windows Key + Numpad Plus to elevate application with administrator privileges (required for broken games that have to run as administrator).

Compatibility:

So far, I’ve tested it successfully on:

• Team Fortress 2
• Battlefield 2 (requires use of shift’ed shortcuts and elevation if you run battlefield 2 with administrator privileges)
• Civilization 4: Beyond the Sword (requires elevation)