Download interactive form locally on my PC

Hi gurus,

my scenario is: NWDS 2004 SP22 and interactive forms. I have an interactive form filled with some datas and I want that pressing a button, the pdf will be saved on my hard disk (in windows\temp folder or other folder). I know that I can use filedownlload UI element but I don't want a pop up to choose the download folder, I want all this as hidden by the user. I hope to be clear.

Thank you very much,

Enrico