As far as I know, you’re not supposed to be able to do any of those things Inertia mentioned, but either it does not work properly or it was intended by Evil Trout that you can browse a few pages while being in a forum without being kicked out. What seems to work fine is refreshing a page, but what I wouldn’t advice you to do is everything that has an effect on the gameplay (e.g. changing/repairing equipment).