I need simple shopping cart, which consists of two forms (login page and shop). First user have to login. The shop is divided in static max 10 categories. Every category has its own products (unlimited). All users see all categories in Tab bar. User pick a category and see products under category. Then he can add products and quantity. After he adds, what he means to pick, he press the Export to XML button, and XML (Excel, OpenOffice) file is generated with some company info and date of calculation. All calculations (sum of all products)are done on-the-fly, every time user adds a product. User can delete one or all products from the list.
The site doesn't allow registration of the user. I don't need any registration GUI, but only raw database with usernames and passwords and product list. It will be all done with database administrtion toolkit.