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Hbutton

HButton is program for PocketPC (2003, WM5, WM6), which allows you to asssign unlimited number of applications to one hardware button on your device. Usage is very simple. If you press and hold button on which HButton is assigned, names of selected applications will be shown in given order. When you will see name of application you want to start, just release button. If you want, you can disable displaying names, and use only vibration or beeping

Detailed usage Instruction : From Developers Site
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Tags: HButton