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On the surface it sounds super simple to just listen to all the click events on a given page and try to log them to a rest API. It’s a bit trickier than that.

Sometimes, the requirements for a web application include a list of users that are currently logged-in. It would seem, at first glance, to be pretty trivial, but because few of us explicitly log out of web applications, the reality can get complicated. Even the best solution is a trade-off. Dino explains the issues and alternatives.

Fingerprinting is one of many methods that software developers use to identify and recognize returning users. The benefits of these systems are obvious: If you delete an app and reinstall it, you can presumably continue right where you left off, with your preferences, and sometimes even your data, held over from the last use.