This program is called DxWnd. For people that don't know what it is; it's not a hack, but it's a program that can make the game you are playing into a window. Meaning not full screen game.
http://www.mediafire.com/download.php?54g0nmmmzcm
Instructions:
Step 1: Download the file from Mediafire and then save it anywhere you want.
Step 2: Extract the folder, that is inside the .zip, onto your desktop. (The folder should be called DxWnd).
Step 3: Double click the folder;make sure the 3 files are always together on the same page or it won't work.
Step 4: Double click DxWnd.exe
Step 5: You see this little window thingy, now you click Edit and then click Add.
Step 6: Click on the little dots on the top right. Browse for the game you want to make a window.
Step 7: Click open and click DirectX8, leave everything else the way it is.
Step 8: Press OK and then you see this little link leading to that file's destination.
Step 9: Double click on that link and your game should start loading.
Step 10: The game is loaded. Now you can play while you talk on msn or whatever.
[Hint] This is really good for hacking because there is a program behind your full screen game. If you make it minimized then you can click your hacks and everything more conveniently. Thank me if I helped.