COMPUTER PART=4

In computers, keyboard navigation keys are used to move the cursor or mouse pointer around the document area on the screen. These are Left Arrow, Right Arrow, Up arrow and Page down, Page up, home and end keys.

Booting is a startup sequence that starts a computer's operating system when it is turned on. A boot sequence is the initial set of operations that the computer forms when switched on. Every computer has a boot sequence. The average computer doesn't understand the boot sequence but is important to know for customizing and troubleshooting your computer.

The first workable prototype of the Internet came in the late 1960s with the creation of ARPANET, or the Advanced Research Projects Agency Network. Originally founded by the US Department of Defence, ARPANET used packet switching to allow multiple computers to communicate on a single network.

Corel DRAW is the best Desktop publishing software that empowers users to create illustrations containing graphics, text and photographs. Corel has an extensive range of tools which enable the user to edit any shape or character with ease and precision, fit text to curves and create custom color separations. It is developed and marketed by Corporation of Ottawa. This tool can open files: Adobe PageMaker, Microsoft Publisher and Word, and other programs can print documents to Adobe PDF using the Writer printer driver, which such software can then open and edit every aspect of the original layout and design.

A hangup also called a hang, is a condition that sometimes occurs when computer programs conflict or do not run properly. The computer seems paralyzed. Clicking the mouse has no effect, regardless of where the arrow or cursor is placed. Sometimes a hangup will resolve itself

In computing, an emulator is hardware or software that enables one computer system (called the host) to behave like another computer system (called the guest). An emulator typically enables the host system to run software or use peripheral devices designed for the guest system. Emulation refers to the ability of a computer program in an electronic device to emulate (or imitate) another program or device.

Dynamic Data Exchange (DDE) is an interproce communication system be allows dats to be communicated or shared between the applications in operating systems such as Windows. Dynamic Data Exchange works based on client and server model communications. The client is the application requesting the data and the one providing the data is called the server. DDE doesn't use any specific  functions or libraries, making it that is easy for anyone to use this protocol

Cache memory works on the principle of locality of reference, a term for the phenomenon in which the same values, of related storage locations, are frequently accessed, depending on the memory access pattern. Caching improves access time and reduces data traffic to data sources that have limited throughout

JPG is a file extension for a lossy graphics file. The JPEG file extension is used interchangeably with JPG. JPEG stands for Joint Photographic Experts Group who created the standard.

PNG stands for Portable Network Graphics. It was created as an open format to replace GIF, because the patent for GIF was owned by one company and nobody else wanted to pay licensing fees. It also allows for a full range of colour and better compression.

GIF Stands for "Graphics Interchange Format." GIF is an image file format commonly used for images on the web and sprites in software programs. Unlike the IPEG image format, GIFS uses lossless compression that does not degrade the quality of the image.

Safari was introduced in January 2003 Safari is a graphical web browser developed by Apple. It is primarily based on open-source software, and mainly WebKit.