Letter I
IBM               International Business Machines. The first company to make a
                  Personal Computer.

iCloud            Apple's internet based storage for its Macs, iPod, iPad and iPhone.

ICMP              Internet Control Message Protocol. Low level information on IP
                  data packets e.g. PING uses the ICMP protocol.
																		
Icon              A picture representation of something on the screen of a program
                  or a file. Windows saves icons as .ICO files, they also can be embedded
                  within DLL or EXE files.

ICQ               I Seek You. Special protocol that allows people to find out if some
                  one is online on the internet and then allow to communicate with them.

ICS               Internet Connection Sharing. A feature of Windows 98 allowing
                  more than one computer to share a single connection to the
                  Internet.
									
IDE               Intelligent Drive Electronics. Name of interface for Hard Disks
                  and CD ROMs. EIDE or Enhanced IDE allowed Hard disks of 512M or
                  larger.

IEEE              Institute of Electrical Engineers. Produces standards for new
                  computer/electronic components e.g. IEEE 1394 is Firewire,
                  IEEE 802.3 is Ethernet, IEEE 802.11 is Wireless etc.
						
IExplorer         Internet Explorer. Microsoft's web browser, developed from NCSA's Mosaic.
			
IFF               Interchangable File Format. Agreed file format between Commodore
                  and Electronic Arts. Used extensively for graphics (ILBM), sound
                  (8SVX), animation (ANIM) and documents (FTXT).

IIS               Internet Information Service. Microsoft's Web Server program used
                  with Windows desktop and Windows Server.
				  
ILBM              InterLeaved BitMap format used for Amiga Graphics files. First
                  used with DPaint by Electronic Arts.

iMac              Consumer version of the Apple Mac starting with the Bondi blue all in one
                  case model with G3 Processor and Mac OS 8.1 or later.

INF               Information file giving details about a specific peripheral.
                  They are stored in C:\Windows\INF and contain text.
			
INFO              Information files used by Amiga computers to store icon graphics, tool name
                  and stack sizes for programs.

Install           Refers to procedure to install software or hardware onto a computer.                  
                  Software install covers copying files to a drawer on the hard disk of
                  a computer, set up a register files for operating system and if necessary                  
                  set up icons for user access to the software.
        
Intel             Developer and manufacture of the Intel 80x86 processor, Pentium, Itanium, Core i3, i5, i7
                  and Xeon processors used on the majority of PCs and Servers.
          						
Interlace         Screen display by doubling the number lines on the screen by
                  interlacing two raster displays together. For example, PAL has
                  256 lines, interlaced PAL has 512 lines.

Internet          Global network of computer using TCP/IP for its method of
                  transmission of data. Covers E-Mail, Newsgroups, FTP, Telnet and
                  the WWW.


Interpreter       Program which converts a high level language to machine code while
                  it is executing. Programs such as BASIC and ARexx use interpreters.

Intranet          Internal local network that may or may not be connected to
                  to internet.
									
IP                Internet Protocol. Basic system used to transmit data over the
                  internet using Unicast (IP to IP). IPv4 uses 4x 8 bit values, IPv6
                  uses 32 bit values for more addresses.

IOS               Apple's mobile operating system for the iPod Touch, iPhone and iPad devices.

IOS               Cisco's internet operating system for its routing and switching network hardware.

IoT               Internet of Things is a system of interrelated devices, objects, animals or people 
                  with unique ids and ability to transfer data over a network.

iPad              Apple's large screen sized tablet which uses iOS for its interface. It has a
                  9.7 inch screen, dual-core A5 processor, Wi-Fi, 3G support, and touch screen. 


iPhone            Apple's touchscreen mobile phone product which initially required a contract 
                  with AT&T in US or O2 in UK etc.


iPod              Apple's mobile MP3 music player which has dominated the music player
                  market. Models, include iPod Nano, iPod Shuffle, iPod classic, and iPod Touch.


IPX               Internetwork Packet Exchange. Used by Novell Networks for its Netware networks.

IRC               Internet Relay Chat. Program used to chat to other people on the
                  internet in real time.

IRQ               Interrupt Request Queue. An interrupt is used by peripherals
                  to indicate to the processor that is ready to send or receive
                  information from the device. PCs have 15 IRQs.
									
ISA               Industry Standard Architecture. Name given to expansion slots on
                  older PCs. Now superceded by faster PCI slots.

ISA               Internet Security and Acceleration Server which is a Firewall and
                  Web Proxy server by Microsoft.

ISDN              Integrated Services Digital Network.
                  A digital network system which is faster than using modems over
                  the telephone line.

ISO               International Standards Organisation. See web site.

ISO9660           Standard in which CD discs are written in. The RockRidge standard is used 
                  for long filenames (PCs use Joliet). NB: ISO = International
                  Standards Organisation.

ISP               Internet Service Provider. Company which setups and looks after
                  your internet account. They provide an account name, and phone
                  number to call with your modem.

Itanium           Intel's 64-bit CPU, the successor to the Pentium processor.
                  Uses new 64-Bit core and a new assembly language and not of
                  the disadvantages of the old x86 processor.

iTunes            Apple's media program to play music, films, video media.
                  On latest versions of macOS it is split into Music, TV, Podcasts apps.