how is the rake you generate (or MGR) calculated?

I am pretty sure from my reading here that there are 2 different ways poker sites can do this...

1 way IS called "contributed" rakeback, right? And It's the kind where you ONLY generate MGR on the hands where you "contribute" some chips to the pot, correct?
(and then you
only get credit for the %age you contributed, correct?

What is the other kind called? Where everyone who is dealt cards divides up the rake share during that hand? This type is better, giving you more MGR, right? (assuming you are a typical tight player...)

Also I'd like to know which/what sites calculate rake which way...
EuroBet?
InterPoker?
Absolute?

This info. is important to know (just as important if not more than the RB %age the affiliates all advertise!) and I'm sure a lot of other folks besides me would like to know this info. ...

Thanks,