1. Supercomputer

2. The operating systems that you are most familiar with use a graphical user interface (GUI, pronounced gooey). A GUI allows the user to interact with the operating system through graphics such as icons and buttons. Files are represented by graphic icons (or pictures) usually using folder images to organize files into groups (representing the directory structure of the hard drive). GUI operating systems, like Windows XP and Mac OS, are considered more user-friendly than command line interfaces.
Graphical user interfaces usually comprise a desktop, or main interface screen, that allows you to select from icons (little pictorial symbols) or menus (lists of activities). Most icons have a rollover feature that pops up an explanation when a mouse rolls over it.
6. Horizontal application, Vertical application
1. Horizontal applications are used across the functional divisions of a company (and are also popular in the consumer market). They are general-purpose programs that address the needs of many people, such as writing (word processing), working with numbers (spreadsheets), and keeping track of information (database).
2. Vertical applications are designed for a particular line of business or for a division in a company. For example, programs are available to handle the billing needs of medical offices, manage restaurants, and track occupational injuries. Vertical applications designed for professional and business use may cost much more than horizontal applications. Some of these programs can cost more than US$10,000.
7. Features of MS-Word, Excel
1. WORD PROCESSING (Word)
One of the most useful productivity program is word processing software (e.g. Microsoft Word, Corel WordPerfect), which allows you to create, edit, format, print, and store text material, using mouse and keyboard.
A computer keyboard contains special-purpose keys to enter, delete, and edit data and execute commands and function keys (F1, F2, etc.) for executing commands specific to the software.
Three features that help you create documents are the cursor, the movable symbol on the display screen; scrolling, the ability to move up, down, or sideways through the text; and word wrap, which continues text on the next line automatically when you reach the end of a line. Features for editing documents are insert and delete, undelete, find and replace, cut/copy and paste, spelling checker, grammar checker, and thesaurus (for presenting alternate words). Documents may be saved, or preserved, in secondary storage, such as hard disk.