Create a set of webpages that registers users for a professional conference. Use a session to track down users as they navigate through the web pages. Include three separate web pages that contain forms: the first form gathers the users name and contact information, the second form gathers the users company information, and the third form prompts users to select the seminars they want to attend at the conference. Include a fourth page that displays the submitted information. The fourth page should include links that allow users to edit the submitted data, along with a submit button that saves the information to a database. A fifth page should display a confirmation that the information was successfully saved. Include code based on reading e-mail addresses that prevent the same user to register twice. PHP