A URL that points to a specific blog or forum entry after it has passed from the front page to the archives. Because a permalink remains unchanged indefinitely, it is less susceptible to link rot. Most modern blogging and content-syndication software systems support such links. Other types of websites use the term permanent links, but the term permalink is most common within the blogosphere.
Taking its name from the catastrophic failure of a nuclear reactor, it is an event that causes the shutdown of a network. It usually results from illegal or misrouted packets that force multiple hosts to respond at once, thereby shutting it down. A meltdown typically lasts only a short time. It is the network equivalent of "thrashing" (as in "to tear up a room") and may be induced by a Chernobyl packet.