best way to handle a form with 60 fields !!!

What is the best way to handle a form with 60 fields ? Is it a maximum number of var that i can regisister in a session ? is it possible to configure this number in php.ini ? I dont'host my web site I use a hoste company where my site is hosted on an linux/apache server with php4. Is it a good idea to register the 60 vars in my session and then to insert them into a databes or is it better to insert only somme of them and make a link to a file where i store all the others fields ? What pissed me off most is to declare and handle so many vars. It' s a form for a congress registration and users have to enter a lot of information. I hope that some kind php master will give me some good tip to speed up my dev. time Thanks and Peace