cbthooks are similar to the other hook types, you call SetWindowsHook (…or SetWindowsHookEx.. ) to set the hook and UnHookWindowsHook to unhook. If you looking to do dialogbox management they’re pretty useful. you should be able to find a bunch of examples on codeproject and msdn2. My use of them has been that you’ll typically set before OpenDs EnableDs and EnableDsUiOnly and unhook when those calls complete. If you have questions, just ask