Unfortunately we have a great many members who visit DaniWeb from both home at work machines, or their laptops, or all sorts of multiple machines. (The vast demographic, actually) Therefore, cookie-based tracking isn't ideal because it doesn't carry over between machines. Additionally, a couple of the moderators and regulars within the Tech Talk forums frequently clear out their cookies (a few times a day) when helping to debug browser issues. (This was brought to my attention at a previous time when I introduced cookie-based tracking for something.)