How to find out invoke process

Dear Axel,

Thank you so much for your instruction.

I was told that I don’t need to know too much details. For each pair of .cpp and .h files, certain functionality are played by them.

I just need to modify such files and let other files untouched, the new functionality could be realized.

But when I found the flow goes in and out of some .cpp files like I mentioned before, I start to worry about what really happened in there.

I will look into the documents and source files to find more.

Thanks a lot