At Joomlashack University we have a main page that lists all the tutorials that are available. We have had several student requests that it would be useful to easily see what lessons they had visited.

Short of some custom programming to achieve this, we implemented a simple visual icon with CSS that would show next to any link that had been clicked on. It uses the a:visited property.

Read original post at source site... http://www.compassdesigns.net/joomla-blog/how-to-easily-set-up-visited-links