You can, for example, see people moving about a website gathering pages as they go and gain a sense of what is happening. This type of visual aid can help engineers to analyse and diagnose problems quickly and take corrective measures - such as adding more server capacity or more communications bandwidth. The tools also collect data about user experiences on a site. Cached pages will not necessarily refer to their original source site. You can monitor traffic through the web server, but it does not give the full story.
Web servers have no sense of a 'session' and treat each request as separate.
This makes it hard to trace a full user experience only from the clickstream analysis. Written in the portable programming language Java, the agents can work only within the web page that sent them and they disappear once the browser leaves the page. Web traffic analysis techniques still have room for further development. Businesses need proven ways to interpret the detailed data about users and their responses to a website if they are to gain the full benefit from capturing all those clicks.