form submission

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If you want to get the details on submission you may require servlet running on backhand which can serve the request made by the user as soon as he press the submit button or commits. In form action you will write the address of the servlet i.e the server which will be hosting the servlet.You can google the List of free web sites which allows hosting of server side scriting elements like Servlets and JSP.
You should be aware of server side programming fundamentals