(i) Red Hat
(ii) Ubuntu
(iii) Cent OS
(iv) Linux Mint

Open source refers to a program or software in which the source code is available to the general public for use and/or modification from its original design, free of charge.

Choose an option logout through the session indicator on the far right side of the top paner.

The server distributions in Linux OS
(i) Ubuntu
(ii) CentOS
(iii) Red Hat
(iv) SUSE
(v) Fedora

(i) The Open source software is free to use, distribute, and modify.
(ii) It has lower cost in most cases in only the fraction of the cost of their proprietary counter parts.
(iii) It is most secured as the code is accessable to everyone.

Some of the functions of Windows Operating System are:
(i) Access applications (programs) on the computer (word processing games, spread sheets, calculators and so on).
(ii) Load any new program on the computer.
(iii) Manage hardware such as printers, scanners, mouse, digital cameras etc.,
(iv) File managemnt activities (For example creating, modifying, saving, deleting files and folders).
(v) Change computer settings such as colour scheme, screen savers and the resolution of monitor.

(i) An operating system (OS) is a software program that enables the computer hardware to communicate and operate with the computer software.
(ii) It also acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs.

The most popular operating systems are as follows:
(i) Windows 7 is the most popular operating system for desktop and laptop computers.
(ii) Android is the most popular smart phone operating system.
(iii) iOS is the most popular tablet operating system.

Save - This will save the document without asking for a new name or location. It will overwrite the original.
Save As- This will prompt you to save the document using a dialog box. This allows to change the file name or location.

Five fox is a browser. Thunderbird is email client which can be used view emails received.

(i) Different desktop managers lead to a fragmented experience.
(ii) Too many package Managers makes Ubuntu hard to learn and master.
(iii) Lack of software
(iv) Hardware compatibility.

The important functions of an operating System.
(i) Memory Management
(ii) Processor Management
(iii) Device Management
(iv) File Management
(v) Security
(vi) Control over system performance
(vii) Job accounting
(viii) Error detecting aids
(ix) Coordination between other software and users