I/O                Input/Output
IC                  Integrated Circuit
IDE                Integrated Drive Electronics
IEEE             Institute of Electrical and Electronics Engineers
INI                Information Necessary Initialization
IP                   Internet Protocol
IPX/SPX       Internet Packet exchange/Sequenced Packet exchange
IRC                Internet Relay Chat
IRDA             Infrared Data Association
IRQ              Interrupt Request line
ISA               Industry Standard Architecture
ISDN          Integrated Services Digital Network
ISO            International Standards Organization
ISP             Internet Service Provider