which PHP files were called when a xThreads newthread was posted?

[DallasCowboys]

I'd like to know that's the sequence of PHP files were called when a new XThreads thread or editPost was posted by clicking on the submit button?

Example:
newThread.php -> Function_post.php -> ??????

Thanks for the help.
I'm trying to troubleshoot the xThread image upload issue in Gomobile.