Hi PerlMonks. Finally I resolved my problem. First I am now conscious of what "stateless" means. Second, as I have to save a hash of has, I couldn't use the hidden filed technique. Solution: As I was working with Dbm::DEEP, I have created a temporary table with this module, save info in session one, and retrieve it for the following session. It works. I find this technique a bit clumsy, but I think there is no ohter solution. Many thanks to all.