How affiliation is working with 2 or more websites?

Hi everyone, I am quite new (since 2 months) and I was wondering how the reward was working with 2 or more websites, and if it’s possible? I mean I would like to use affiliate links in my differents websites hosting in dreamhost with for instance a wordpress widget or Question2answer. If I do that with differents website is there a way to track everything coming from different websites or is that the same track ID? Can we track with subID by pages as well?

Second question: is there specific rewards after 10 or more affiliations working?