Most users think of compilers, databases, and other "system software" as applications. User-written software: End-user development tailors systems to meet users' specific needs. User software includes spreadsheet templates and word processor templates. Even email filters are a kind of user software. Users create this software themselves and often overlook how important it is. Depending on how competently the user-written software has been integrated into default application packages, many users may not be aware of the distinction between the original packages, and what has been added by co-workers. Computer software has to be "loaded" into the computer's storage (such as the hard drive or memory). Once the software has loaded, the computer is able to execute the software. This involves passing instructions from the application software, through the system software, to the hardware which ultimately receives the instruction as machine code. Each instruction causes the computer to carry out an operation-moving data, carrying out a computation, or altering the control flow of instructions.
They do not serve as links, are not part of any system function or computer software. Instead they are part of the communication language of users across systems. For these computer icons, customization and modifications are not only possible but in fact expected of the user. A text hyperlink performs much the same function as the functional computer icon: it provides a direct link to some function or data available on the system. Although they can be customized, these text hyperlinks generally share a standardized recognizable format, blue text with underlining. Hyperlinks differ from the functional computer icons in that they are normally embedded in text, whereas icons are displayed as stand-alone on the screen real estate. They are also displayed in text, either as the link itself or a friendly name, whereas icons are defined as being primarily non-textual. Because of the design requirements, icon creation can be a time-consuming and costly process. There are a plethora of icon creation tools to be found on the Internet, ranging from professional level tools through utilities bundled with software development programs to stand-alone freeware.
The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales before moving to Port Talbot, Wales (until 1984) and by Eurohard S.A. Casar de Cáceres, Spain (from 1984 to 1987), and for the US market by Tano of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively. 2.7 Dragon 32 vs. Dragon Data entered the market in August 1982 with the Dragon 32. The Dragon 64 followed a year later. The computers sold well initially and attracted the interest of independent software developers including Microdeal. A companion magazine, Dragon User, began publication shortly after the microcomputer's launch. Despite this initial success, there were two technical impediments to the Dragon's acceptance.
And it was awesome. Everything about this computer is loud: The groan of the power supply is loud. The hum of the cooling fan is loud. The whir of the hard disk is loud. The clack of the mechanical keyboard is loud. It’s so loud I can barely think, the kind of noise I usually associate with an airline cabin: whoom, whoom, whoom, whoom. This is the experience a computer user would have had every time she booted up her Macintosh SE, a popular all-in-one computer sold by Apple from 1987 to 1990. By today’s standards the machine is a dinosaur. It boasts a nine-inch black-and-white display. Mine came with a hard disk that offers 20 megabytes of storage, but some lacked even that luxury. And the computer still would have cost a fortune: The version I have retailed for $3,900, or about $8,400 in 2019 dollars. That’s a lot of money.
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