Unregisters an appbar by removing it from the system's internal list. The system no longer sends notification messages to the appbar or prevents other applications from using the screen area used by the appbar.
A pointer to an APPBARDATA structure that contains the handle to the appbar to unregister. You must specify the cbSize and hWnd members when sending this message; all other members are ignored.
Always returns TRUE.
This message causes the system to send the ABN_POSCHANGED notification message to all appbars.
Minimum supported client
|Windows XP [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|