ClickTracks Professional Server can be configured to use a specific session cookie to improve the accuracy of following visitors through the site, especially if your site has many visitors from AOL. Professional Server also uses a powerful database to store data about visitors and to lookup that data when a visitor comes back to the site.
The database stores the persistent ID, the landing page, referrer, time of last visit, time of first visit. Using this data ClickTracks can calculate simple data like the number of unique visitors, and can map conversion events back to the original campaign and search engine/keyword.
The following applies to ClickTracks Pro when using logfiles. ClickTracks Pro Hosted (using JavaScript) automatically sets suitable cookies and requires no configuration.
Configuring session cookies
A session cookie goes away when the user closes the browser window. It's the opposite of a persistent cookie. Many dynamic site generation tools like PHP and ASP contain easy session cookie management. ClickTracks (both Analyzer and Pro) contains support for these standard session cookies. ClickTracks Pro can be configured to use any custom session cookie. If your site uses a custom cookie, simply define this inside the ClickTracks Pro Server.
Persistent cookie tracking for better campaign accuracy.
See Using Persistent Cookies To Improve Campaign Tracking
