The source of Windows CE 3.0 is "open" at MS web site. Note the " marks. What I mean is you can see the source which is good enough for most serious dvelopers. I once made the mistake of suggesting the source was "open". Note the " marks. If you are a professional developer and want to see what is happening when you call something, there it is, if you are an anti MS robot, check it out and complain.