There are probably a thousand different ways to manage it depending on what exactly you are trying to do. Javascript can open up windows and control the windows. So you can open a window, submit several forms there, and close it -- or even submit the last form there. You can also use some black magic on the server side, or a thousand other things. Go to Expedia.com and walk through the javascript it takes you to get to the "My Profile" link for an example. It doesn't submit any forms, but (perhaps to foil spiders) sets cookies and then does a
to jump from page to page. Things like this aren't common, but they are out there to spoil spiders on sites that have a reason to not want their sites spidered -- i.e. ebay, paypal, similar sites.