The HD2 can do many things, and with Windows Mobile anything is possible. This new tweak was made by the XDA member exidler. The tweak uses the HD2â€™s proximity sensor to turn of the screen when a finger or any object is detected in front of it. This would work a little like during a phone call, except it does not turn back on until you press a hard button. This tool only works in portrait mode, to prevent accidental screen-offs when using landscape apps.
It switch off screen using proximity sensor detection.
Like alternative power button.
After proximity detected – screen switched off and proximity sensor don’t used until screen will be switched on again manually.