Well, I think the fact that the count is supposed to carry across multiple logins would say to me that it must persist.
What's more interesting: If, after logging in, the student goes to some other page and then comes back to this same page--without logging out, without closing the browser--is that counted as another visit to the page? Or are we really supposed to be counting successful logins?
> Please define the parameters of your requirement further.
Or define them at all, really.