Click rates are harder to measure than deliveries of a pointer. Because the next page delivered can be on a different site, the originating server must keep a record of these clicks. This is a function that is not automatically done by the server software and requires additional software to count the click. PioneerPlanet does track clicks and reports them to our advertisers. Sessions cannot be measured accurately A session is the period of time that a reader remains on a single Web site.
Sessions are difficult to define, let alone measure.
A good Web site will include links to other sites. Using these links, and the browser's Forward and Back buttons, a reader can move among multiple sites in a way that makes a session especially difficult to define. This is especially true because there is no connection between the reader's computer and the Web site's server after a page is delivered. While the reader is reading the page, the server has gone on to serving another reader somewhere else in the world. This problem is compounded by the issues inherent in counting individual users.