Tools and tips to read and understand open source?

[5Alive]

Hi,

I have downloaded some c++ open source code which I'd like to study to see how it all works. This is a multiple file project, so on first inspection there is a lot of navigation between header file and code files.

Naturally, I searched a little using Google and found a few IDEs that claim to help with the anaylsis of unknown code. Tools like Source Insight, Understand for C++, Source Publisher, UltraEdit and so on.

What tools do you guys use? (commercial or free) for Windows.

I'd like to ask what you guys recommend to help accomplish a quick and reliable analysis?

This project may be complicated by the fact that I am learning C++ as I go along. Do you consider producing UML diagrams will be a helpful aid to my understanding of how things work together?

I appreciate recommendations to help me get this project off to a productive start.

One I know how it all works I hope to add my own code to meet my requirements.

Thanks.