A local area network is a computer network covering a small geographic area, like a home, office, or group of buildings. Current LANs are most likely to be based on switched IEEE 802.3 Ethernet technology, running at 10, 100 or 1,000 Mbit/s, or on IEEE 802.11 Wi-Fi technology. Each node or computer in the LAN has its own computing power but it can also access other devices on the LAN subject to the permissions it has been allowed. These could include data, processing power, and the ability to communicate or chat with other users in the network

Source: wikipedia.org

A hyperlink (often referred to as simply a link), is a reference or navigation element in a document to another section of the same document, another document, or a specified section of another document, that automatically brings the referred information to the user when the navigation element is selected by the user. As such it is similar to a citation in literature, but with the distinction of automatic instant access. Combined with a data network and suitable access protocol, a computer can be instructed to fetch the resource referenced. Hyperlinks are part of the foundation of the World Wide Web created by Tim Berners-Lee, but are not limited to HTML or the web. Hyperlinks may be used in almost any electronic media.

Source: wikipedia.org

The account name used to gain access to a computer system, not a password. Also can mean the act of entering onto a computer system.

Source: Sweeney, Susan

Reading Usenet newsgroups, consumer online service forums, or Internet mailing lists without posting anything, just reading. A lurker is a person who observes what everyone else is doing within the group.

Source: Sweeney, Susan