Where parse project files?

For implementing Intellisense and it is necessary realization parsing project files. Where I can do it

At opening a file in the editor VS call:

public override AuthoringScope ParseSource(ParseRequest req)

but how parse the closed files

And how determinate the project which the req.FileName associated with it.

winformmaker
The IronPython integration sample, when combined with the separate IronPython engine code, is a good place to start.
LarsK

The source is available to both the IronPython engine ( language service, codeDOM, etc ) as well as the IronPython integration.

By reading the 2 sets of sources, you can determine how this is done.
wam41887
My integration based on the IronPyton sample. But I don't understand how LanguageService communicate with projects. :(

For high-grade integration I must parse all sources in the project. But how confront Source object (represent source file during parsing) with source file in project By file path
Where parse project files?