If you are planning to build a widget for Windows Mobile 6.5 there is quite a useful page of documentation available at MSDN: http://msdn.microsoft.com/en-us/library/dd721906.aspx
Building amazing multi-platform solutions for iOS, Android, Mac, Linux and Windows
If you are planning to build a widget for Windows Mobile 6.5 there is quite a useful page of documentation available at MSDN: http://msdn.microsoft.com/en-us/library/dd721906.aspx