Many of the Windows Mobile smart phones manufactured by HTC for AT&T have a button labeled "PTT." This button was created at AT&T's request to promote AT&T's fee-based "Push-To-Talk" service. Many users don't want to use that service and instead want to reprogram the PTT button to have a function that is useful to them. This can be done through the Windows Mobile registry.
Instructions
1. Open the registry editor on the device.
2. Navigate to HKEY_LOCAL_MACHINE/Services/PTT. Delete the entire key.
3. Navigate to HKEY_LOCAL_MACHINE\Software\Microsoft\Shell\Keys.
4. Create a new key with the name "40C6" and, In this key, create a new string value called "PTT Button," both without quotation marks.
5. Close the registry editor.
6. Open the "Start" menu on the device and select "Settings." Select "Personal." Select "Buttons."
7. Select the "PTT Button" entry and use the drop-down list box at the bottom of the screen to assign a function to the PTT button.
8. Turn the device off and back on to initialize the new settings.
Tags: Navigate HKEY_LOCAL_MACHINE, registry editor, Windows Mobile