Generally, client pages can be divided into two categories: reading pages and posting pages. The former is used to read data from the user, and the latter is used for displaying feedback from the server. To interface to the client to get user data, most often, the server calls the getParameter() method that belongs to the request object. To send feedback to the client, the server usually uses the println() method that belongs to the out object. With this pair of methods, a server can eas-ily communicate with the client and transfer data between them.
