GHelper v1.3 (Gaming Helper) - This free software helps Gamers by providing Hotkeys to Windows Screen Gamma and Volume controls. Allows mapping most keys including the WIN key. Works with many games. Written for HalfLife and CounterStrike.
GHelper has 3 modules:
TransXP - Place mouse on any window title, press defined keys to make window transparent. (WinXP only)
MammaGamma - use defined keys to adjust screen brightness (gamma). Works with most games. (Win98/Me/XP)
VolControl - use defined keys to adjust master sound volume, mute or un-mute. (Win98/Me/XP)

The license of this software is Freeware, you can free download and free use this game utility software.