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The number of unassigned Internet addresses is running out, so a new classless scheme called CIDR
is gradually replacing the system based on classes A, B, and C and is tied to adoption of IPv6.
IR
An abbreviation for infrared.
IrDA
Infrared Data Association. An organization which produces standards for communication using
infrared as the carrier.
IRQ
Interrupt Request. An acronym for the hardware signal to the CPU that an external event has occurred
which needs to be processed.
KB
Kilobyte. One thousand bytes.
LAN
Local Area Network. An interconnection of computers and peripherals within a single limited
geographic location which can pass programs and data amongst themselves.
LCD
Liquid Crystal Display. A type of display which makes images by controlling the orientation of
crystals in a crystalline liquid.
Lithium ion Battery
A type of rechargeable battery which has a high power-time life for its size and is not subject to the
memory effect as Nickel Cadmium batteries.
LPT Port
Line Printer Port. A way of referring to parallel interface ports because historically line printers were
the first and latter the most common device connected to parallel ports.