Usually when you want to toggle your Bluetooth, WiFi or Data Connection on or off, you go to the CommManager and do it from there. With HD2 Connections it is now possible to do all that in a single step, by tapping on shortcuts to predefined executables.
After you install the cab, you will find shortcuts that will allow you to switch on or off your Bluetooth, WiFi and Data Connection. In addition, the latest cab (post #5) comes with a Soft Reset icon you can use to restart your device.
(Source: XDA Developers)