Thread:Project:Support desk/Logging a User When they sign in rather than when they make a change.

Hi, I have a media wiki site set-up whereby customers cannot make any changes to the web pages only staff. Both the staff and customers have to log into the site to see the content. I can view a log of changes made to the web pages by the staff, but I would like a log to show when the customers login to view the content, is this possible?