Keeping your computer secure helps you avoid malware and direct hacking attempts designed to steal your personal information. Here are some ways you can help reduce your online risk when you use your computer at home. Windows has a firewall already built in and automatically turned on. Make sure to turn on automatic updates in Windows Update to keep Windows, Microsoft Office, and other Microsoft applications up to date. Turn on automatic updates for non-Microsoft software as well, especially browsers, Adobe Acrobat Reader, and other apps you regularly use. If you run Windows you have Windows Security or Windows Defender Security Center already installed on your device. Tip: If you're a Microsoft 365 Family or Personal subscriber, you get Microsoft Defender included with your subscription at no extra charge. It helps protect all your devices - Windows, Mac, Android, and iOS. For more information see Getting started with Microsoft Defender.
Download Your Information(Opens in a new window). Check the boxes below of want you want, then at the top or bottom of the page, click Request a Download. It may take a while for the file to be ready. It'll appear under that Available Copies tab in the middle of the page. Twitter is similar, but less complex: on your desktop browser go to your account settings(Opens in a new window). Under Your Account, click "Download an archive of your data." You'll be emailed a link to the full file of all your tweets and uploaded pics. You can only do this every 30 days. Request Download. They'll also email you a file of your info. Download your data. This can take days to process if you have a lot of videos on the service, and once it's available to download (in the same area of the app) you only have four days to grab it. Get Our Best Stories! Sign up for What's New Now to get our top stories delivered to your inbox every morning. This newsletter may contain advertising, deals, or affiliate links. Subscribing to a newsletter indicates your consent to our Terms of Use and Privacy Policy. You may unsubscribe from the newsletters at any time. Your subscription has been confirmed. Keep an eye on your inbox!
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Program execution might be likened to reading a book. While a person will normally read each word and line in sequence, they may at times jump back to an earlier place in the text or skip sections that are not of interest. Similarly, a computer may sometimes go back and repeat the instructions in some section of the program over and over again until some internal condition is met. This is called the flow of control within the program and it is what allows the computer to perform tasks repeatedly without human intervention. Comparatively, a person using a pocket calculator can perform a basic arithmetic operation such as adding two numbers with just a few button presses. But to add together all of the numbers from 1 to 1,000 would take thousands of button presses and a lot of time, with a near certainty of making a mistake. On the other hand, a computer may be programmed to do this with just a few simple instructions.
The "state" of each user and their programs would have to be kept in the machine, and then switched between quickly. This would take up computer cycles, and on the slow machines of the era this was a concern. However, as computers rapidly improved in speed, and especially in size of core memory in which users' states were retained, the overhead of time-sharing continually decreased, relatively speaking. The first project to implement time-sharing of user programs was initiated by John McCarthy at MIT in 1959, initially planned on a modified IBM 704, and later on an additionally modified IBM 709 (one of the first computers powerful enough for time-sharing). One of the deliverables of the project, known as the Compatible Time-Sharing System or CTSS, was demonstrated in November 1961. CTSS has a good claim to be the first time-sharing system and remained in use until 1973. Another contender for the first demonstrated time-sharing system was PLATO II, created by Donald Bitzer at a public demonstration at Robert Allerton Park near the University of Illinois in early 1961. But this was a special-purpose system.
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