InfoPath Dev

So when I speak about URL I speak about the one that we will use to call the form. In the URL you will have the storage place and the name of the form in order to open it and on that one I wanna had an ID and use this ID in my form to fill it. Is it more understandable?  Thanks  

Hi, I would like to publish my forms on a web server via form service and I wold like to pass to the form a parameter via the URL. I was wondering if someone know how to do that? How can I say to my field that he will receive this data from the URL? Thanks for your help