Visual Studio projects have an option to create XML Documentation Files.I understand that XML Documentation Files can be useful if you'd like to run a program like Sandcastle or NDoc or whatever to create MSDN-Style API docs. Fine. I don't care about that.According to this link: http://msdn.microsoft.com/en-us/library/s0we08bk.aspx\[quote\] When you add the /doc switch to the Visual Basic, C#, or C++ compiler command line, an .xml file is generated that serves as the basis for IntelliSense documentation. \[/quote\]So that makes me think that Intellisense comments can appear from these generated XML files.But I created a little Test app where I call a method in a totally different project and the XML comment appears in my Intellisense