1.6.1 Control Document Appearance and Content
1.6.2 Control the Browser
1.6.3 Interact with HTML Forms
1.6.4 Interact with the User
1.6.5 Read and Write Client State with Cookies
A cookie is a small amount of state data stored permanently or temporarily by the client. Cookies may be transmitted along with a web page by the server to the client, which stores them locally. When the client later requests the same or a related web page, it passes the relevant cookies back to the server, which can use their values to alter the content it sends back to the client. Cookies allow a web page or web site to remember things about the client -- for example, that the user has previously visited the site, has already registered and obtained a password, or has expressed a preference about the color and layout of web pages. Cookies help you provide the state information that is missing from the stateless HTTP protocol of the Web.
1.6.6 Still More Features