I have a big MPEG file in which I have an entrypoint. Hence ONE chapter that splits (not physically though) the MPEG into 2 parts.

Then if I press NEXT (on my remote control) from the first part, then where does that take me to? ...the next chapter(i.e.second part) or back to the main menu...

As for DVDs, if u do something like that,it takes you to the next chapter.