MACINTOSH:-
A popular model of computer made by Apple Computer. Introduced in 1984, the Macintosh features a graphical user interface (GUI) that utilizes windows, icons, and a mouse to make it relatively easy for novices to use the computer productively. Rather than learning a complex set of commands, you need only point to a selection on a menu and click a mouse button.
Moreover, the GUI is embedded into the operating system. This means that all applications that run on a Macintosh computer have a similar user interface. Once a user has become familiar with one application, he or she can learn new applications relatively easily. The success of the Macintosh GUI led heralded a new age of graphics-based applications and operating systems. The Windows interface copies many features from the Mac.
There are many different Macintosh models, with varying degrees of speed and power. All models are available in many different configurations. All models since 1994 are based on the PowerPC microprocessor.
UNIX:-
Unix (officially trademarked as UNIX, sometimes also written as UNIX with small caps) is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations.
As of 2007, the owner of the trademark is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification are qualified to use the trademark; others are called "Unix system-like" or "Unix-like".
Os/2:-
You are an OS/2 user whether you realize it or not - whenever you use an ATM machine at your bank. You also encounter OS/2 when you shop at your local supermarket, when you drive on the Century Freeway in Los Angeles, when you make airline reservations, or when you shop at KMart. Particularly, OS/2 is used by banks and in other places where money is being handled and reliability is absolute necessary.
On the desktop, OS/2 is the most elegant of operating systems, and is easier to learn, easier to configure, and easier to use than Windows95/98. The OS/2 Workplace Shell (the desktop) is completely object oriented, something the Win95 desktop, and even Linux desktops, can only pretend. The OS/2 desktop has been integrated with the Internet for years, something Windows98 has just discovered. Also, OS/2 runs for days, weeks, even months without crashing.
OS/2 comes in two varieties: OS/2 Warp and OS/2 Warp Server - client and server. The client fully supports networking on a peer-to-peer basis, and is compatible with servers running OS/2, Windows NT, Linux, Unix and others. The server version completely supports DOS and all varieties of Windows clients and servers. Microsoft Networking, is, after all, just a version of IBM's PC-Net network
