Hello, we were using a self coded cProg.exe (return) to avoid windows taking ownership during software runtime. With PPC 2003 and WM6.5 it was no problem. During running the AppCenter and our cProg.exe the Windows Screen appears from time to time for a few seconds. This only happens when cProg.exe is replaced? Is there another possibility to kill or replace the cProg.exe during Pin Entry? kind Regards Markus PS: for the Pin we use these native Functions:         [DllImport("cellcore.dll")]         private static extern int SimInitialize(int dwFlags, IntPtr lpfnCallBack, int dwParam, ref IntPtr lphSim);         [DllImport("cellcore.dll")]         private static extern int SimUnlockPhone(IntPtr hSim, string lpszPassword, string lpszNewPin);