"Stealth sites" account for a particular form of hidden advertisement. Stealth sites look like magazines, nicely designed and featuring articles on different topics, but in reality are set up for the sole purpose of featuring a certain companies products and services.
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4th millennium B.C.
In Sumer
Writing and calculating came into being at about the same time. The first pictographs carved into clay tablets were used for administrative purposes. As an instrument for the administrative bodies of early empires, which began to rely on the collection, storage, processing and transmission of data, the skill of writing was restricted to only very few. Being more or less separated tasks, writing and calculating converge in today's computers.
Letters are invented so that we might be able to converse even with the absent, says Saint Augustine. The invention of writing made it possible to transmit and store information. No longer the ear predominates; face-to-face communication becomes more and more obsolete for administration and bureaucracy. Standardization and centralization become the constituents of high culture and vast empires as Sumer and China.
3200 B.C.
In Sumer the seal is invented.
About 3000 B.C.
In Egypt papyrus scrolls and
About 1350 B.C.
In Assyria the cuneiform script is invented.
1200 B.C.
According to Aeschylus, the conquest of the town of Troy was transmitted via torch signals.
About 1100 B.C.
Egyptians use homing pigeons to deliver military information.
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Newsgroups are on-line discussion groups on the Usenet. Over 20,000 newsgroups exist, organized by subject into hierarchies. Each subject hierarchy is further broken down into subcategories. Covering an incredible wide area of interests and used intensively every day, they are an important part of the Internet.
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A proxy server is a server that acts as an intermediary between a workstation user and the Internet so that security, administrative control, and caching service can be ensured.
A proxy server receives a request for an Internet service (such as a Web page request) from a user. If it passes filtering requirements, the proxy server, assuming it is also a cache server, looks in its local cache of previously downloaded Web pages. If it finds the page, it returns it to the user without needing to forward the request to the Internet. If the page is not in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own
Source: Whatis.com