GO2 General Description

GO2 is a set of in-game tools designed to enhance your gaming experience. It enables the player to launch applications from inside the game, without leaving and missing out on the action. GO2 plug-ins currently consist of a web browser, IM, music player, a games performance monitor (FPS), an in-game clock and a utility for screen and video capture. The plug-ins system is flexible and extendible, allowing fast and easy addition of new plug-ins.
You can find the list of supported games here

Running GO2

Once downloaded and installed, the GO2 client runs in the background. Whenever a supported game is launched, the GO2 toolbar is displayed in-game, allowing the launch of the various plug-ins. At any time it can be hidden or re-launched, simply by pressing Ctrl-Shift-G. The toolbar can be dragged to any location on the screen.