We will assume traffic exchange A gives you credits for unique hits to your referral URL. On exchange B then, you list your referral URL for exchange A. As you receive unique hits from B, you are building extra surfing credits on exchange A which are added to the results of your own surfing.

Over time this can add up to a lot of extra hits. The double benefit is that you are building a downline in exchange A via your surfing on B, while at the same time getting extra promotion of your biz-ops on A.

Go to this page for a list of manual hit exchanges that grant credits for unique hits. 

Using Surf Robots

The internet being what it is, you can find software 'robots' that attempt to automate the manual clicking process and bypass the anti-cheat mechanisms that most manual traffic exchanges develop to catch them at work.

Don't use such software. If you do, and are caught - which is highly likely - it won't be long before you will find it very difficult to get a membership in any traffic exchange anywhere. News that you are a 'cheater' spreads rapidly.

Unless you like moving house, legally changing your name, and getting a new ISP address every two or three months in order to stay online, don't use them. And oh - if you earn cash from the website and are paid, that's considered fraud if you have been using a surf robot or multiple identities. Think 'jail' and/or 'criminal conviction'.

 Next... Using traffic exchange downline builders