What makes IntelliSense work or not?

If I add a new cpp-sourcefile to my project, that is just supposed to provide simplification funcs and macros for some API tasks, IntelliSense no longer displays function declarations when I begin typing a function call. I've #included the same headers Visual Studio did in my main source file, so I assume this about the IntelliSense DB beeing built just for those source files VS itself created. How can I get Intellisense to help me accross all my source files?
[471 byte] By [wikoh] at [2008-2-20]
# 1
Hello,

The Intellisense feature is provided by the VS Editor so you will likely get a better answer on the Visual Studio General forum.

Thanks,
Jeremy

JeremyJones at 2007-9-9 > top of Msdn Tech,Visual Studio,Developer Documentation and Help System...
# 2
Actually, the C++ team owns this feature area. Could you post a snippet of code or attach a small project that exhibits this behavior? We have fixed numerous issues in our Intellisense engine since Beta2 as well, so you might want to try your scenario on a more recent build.

Thanks,

BorisJabes at 2007-9-9 > top of Msdn Tech,Visual Studio,Developer Documentation and Help System...

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