![]() Most computers, human beings, and elephants are stateful. The Internet (including the World Wide Web) can be thought of as a stateless system or machine. In formal protocol specifications, a finite state machine is an abstract desciption of how a stateful system works that describes the action that follows each possible state. The area and the information that Web browsers and server applications put in this area is called a cookie. Web browsers such as Netscape Explorer and Microsoft Internet Explorer provide an area in their subdirectories where state information can be stored and accessed. In order to have stateful communication, a site developer must furnish a special program that the server can call that can record and retrieve state information. Each communication is discrete and unrelated to those that precede or follow. In other words, there is no recorded continuity. Each request from a user for a Web page or URL results in the requested pages being served, but without the Web (HTTP) server remembering the request later. ![]() The Web's Hypertext Transfer Protocol ( HTTP ), an application layer above TCP/IP, is also stateless. IP is connectionless as well as stateless. (The upper layer Transmission Control Protocol - TCP - does relate packets to each other, but uses the information within the packet rather than some external information to do this.) The term connectionless is also used to describe communication in which a connection is made and terminated for each message that is sent. When you request a Web page from a Web site, the request travels in one or more packets, each independent of the other as far as the Internet Protocol program itself is concerned. Each packet travels entirely on its own without reference to any other packet. The Internet's basic protocol, the Internet Protocol ( IP ), is an example of a stateless interaction. (Computers are inherently stateful in operation, so these terms are used in the context of a particular set of interactions, not of how computers work in general.) Stateful and stateless are derived from the usage of state as a set of conditions at a moment in time. Stateless means there is no record of previous interactions and each interaction request has to be handled based entirely on information that comes with it. Stateful means the computer or program keeps track of the state of interaction, usually by setting values in a storage field designated for that purpose. ![]() If this were the meaning of 'esse is percipi,' then to say that a thing was real. Stateful and stateless are adjectives that describe whether a computer or computer program is designed to note and remember one or more preceding events in a given sequence of interactions with a user, another computer or program, a device, or other outside element. The second is (2) that what is meant by esset though not absolutely.
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