OS & DOS

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An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is an essential component of the system software in a computer system. Application programs usually require an operating system to function. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware,[1][2] although the application code is usually executed directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers. Examples of popular modern operating systems include Android, BSD, iOS, Linux, OS X, QNX, Microsoft Windows,[3] Windows Phone, and IBM z/OS. All these, except Windows and z/OS, share roots in UNIX An operating system or OS is a software program that enables the computer hardware to communicate and operate with the computer software. Without a computer operating system, a computer and software programs would be useless.When computers were first introduced the user interacted with them using a command lineinterface, which required the user to perform a series of commands in order to interact with the computer and its hardware and software. Today, almost every computer is using a Graphical User Interface (GUI) operating system that is much easier to use and operate. Examples of computer operating systems;Microsoft Windows 7 - PC and IBM compatible operating system. Microsoft Windows is the most commonly found and used operating system. Apple MacOS - Apple computer operating system. The only Apple computer operating system. Ubuntu Linux - A popular variant of Linux used with PC and IBM compatible computers. Google Android - operating system used with Android compatible phones. iOS - Operating system used with the Apple iPhone

Mail merge
Mail merge is a software function describing the production of multiple (and potentially large numbers of) documents from a single template form and a structured data source. The letter may be sent out to many "recipients" with small changes, such as a change of address or a change in the greeting line. MS Word Mail Merge allows a user to send letters or documents to many people simultaneously; users simply create one document that contains the information that will be the same in each version, and then add placeholders for the information that will be unique to each version

Process
1 Click on mail merge and then scroll down to Step by Step Mail Merge Wizard. Follow the steps in the task pane to navigate your way through the Mail Merge process.. 2 Choose a document type. This document contains the information that will remain the same in each version, such as the return address or company logo. If you’ve already created this document, you can click the USE CURRENT DOCUMENT. Otherwise, click Start from a template or Start from existing document, and then locate the template or document that you want to use. 3 Connect to the data source. The information that you want to merge into your documents will be stored in the data source, and can be found in your Outlook contacts or in an existing file. If you have not yet created this information, select Type a New List to begin creating. 4 Indicate what records you want to include by checking or un-checking the subsequent box. 5 Add fields to your document. Think of a “field” as that information that is unique to each letter. For example, it might be the address of each recipient. You could also choose More Items. This will allow you to add any specific information that you...
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