The most accurate way to track clicks is to simply look at your click count in your webmaster affiliate account and then have some friends click on your affiliate link, preferably from different IP addresses, and re-check your stats to make sure all of the clicks are counted.
For example, if you have 10 friends each click once on your link, you should see 10 additional clicks counted on your account when you refresh your stats.
Using a banner serving program’s stats to count clicks is not as accurate because of variances in the ways that “clicks” are counted. I have personally tested our stats using my own affiliate links, and every time I click on my links the click is counted — even if I click several times in a row from one computer. We count “raw” clicks, not “unique” clicks from different IP addresses. But not all affiliate programs work that way. Some will only count one click per IP address during a certain time period.
So if you are concerned that any affiliate program is not accurately tracking your web traffic, use the “friends” counting method for the most accurate test.