Is there any way to mark all messages on this forum read? Because I log in really rare, but I read most messages as guest so I would like to mark all topics that were modified since my last login read withdout seeing them once more? (because, in fact, I've already red them)
On the main forum page, just above the Who Is Online box, there is a small red link that says "Mark all forums read". This should be what you're looking for