How computer change my life.

The internet -- As a child, I read every science fiction book I could get my hands on, and surprisingly, very few postulated anything like the internet. Neither did I, yet when I finally grasped the idea, it seemed so obvious, so exactly what human beings needed. In only a few years, I was able to look virtually anywhere in the world, 24/7, for the information I needed. Suddenly, national boundaries seemed much less meaningful. My smart-ass answer, when people asked me where I was from, became "Earth."

Google -- Without an effective index, the internet would be as useless as a library full of randomly shelved books without covers. While early search engines like Alta Vista did an OK job of finding content, Google was a quantum leap forward. It's notion of using page popularity to rank search responses rightly dominated the market overnight.

Online gaming -- I don't have a dog in this hunt, but I'm aware that the leap from gaming on the home television to joining a worldwide gaming community via the xBox and other systems has enthralled whole generations. If it had existed when I was young, I'd have been addicted to it, I'm sure. I hope I would have had the sense to avoid internet gambling, though. That's an expensive addiction.

Instant messaging -- Before I began using instant messaging, or IM, I didn't understand how it differed from e-mail. Now I think I do. If e-mail is a postal letter, IM is a note passed from hand to hand behind the teacher's back. You e-mail your mom, IM your BFF. IM is social, e-mail is professional. IM is, well, instant. E-mail is like, whenever.

 

Advantages of having and using computers

A Computer is an electronic device that processes data according to a given list of instructions. It has many uses and advantages. Some of them are as follows:

- Easy processing of complex tasks.
- It saves time by quick manipulation of data as compared to when done manually.
- The errors in data processing are minimized when a computer is used.
- It has helped in making communication easier by using internet.
- It stores, retrieves, and processes a large amount of data.
- It helps in multitasking of various jobs.
- Data is more secure and easier to use.

Potential threat of using computers

If you connect to the Internet, allow other people to use your computer, or share files with others, you should take steps to protect your computer from harm. Why? Because there are computer criminals (sometimes called hackers) who attack other people's computers. These people can attack directly, by breaking into your computer through the Internet and stealing your personal information, or indirectly, by creating malicious software to harm your computer.

 














 

How to use touch screen.

The touchscreen technology allows you to swipe your finger across the screen or tap an icon to provide input to the device. Just as you may have become used to with your mobile phone, you use the pads of your fingertips (not your fingernails). There are several methods you can use for getting around and getting things done on an iPad using its Multi-Touch screen, including:

• Tap once. To open an application on the Home screen, choose a field such as a search box, select an item in a list, select a backward arrow to move back one screen, or follow an online link, tap the item once with your finger.

Tap twice. Use this method to enlarge or reduce the display of a Web page or zoom in or out in the Maps app.You can use a three-finger tap to zoom your screen to be even larger. This is handy if you have vision challenges.

• Pinch. As an alternative to the tap-twice method, you can pinch your fingers together or move them apart on the screen when you're looking at photos, maps, Web pages, or e-mail messages to quickly reduce or enlarge them.
  
• Drag to scroll (also referred to as swiping). When you press your finger to the screen and drag to the right, left, up, or down, you move around the screen.
  
• Flick. To scroll more quickly on a page, quickly flick your finger on the screen in the direction you want to move.
• Tap the Status bar. To move quickly to the top of a list, Web page, or e-mail message, tap the Status bar at the top of the iPad screen.
• Press and hold. If you're in any application where you can select text, such as Notes or Mail, or if you're on a Web page, pressing and holding near text will select a word and bring up editing tools that allow you to select, cut, or copy text. You can also use this method to reposition the insertion point under the magnifying glass icon that appears.

If you feel like a practice session, try out these actions:

1. Tap the Safari button to display the Web browser. (You may be asked to enter your Wi-Fi network password to go online.)
2. Tap a link to move to another page.
3. Double-tap the page to enlarge it; then double-tap again to reduce its size.
4. Drag one finger around the page to scroll.
5. Flick your finger quickly on the page to scroll more quickly.
6. Press and hold your finger down on text that isn't a link. A magnifying glass icon appears.
   Release your finger and the item is selected, and a Copy tool is displayed.
   
7. Press and hold your finger on a link or an image.
   A menu appears with commands that allow you to open the link or picture, open it in a new page, or copy it. The image menu also offers a Save Image command.
8. Put your fingers slightly apart on the screen, and then pinch your fingers together to reduce the page; with your fingers already pinched together, place them on the screen, and then move them apart to enlarge the page.
9. Press the Home button to go back to the Home screen.

Difference between a cold and warm reboot

Cold Reboot is where you turn the computer completely off so there is no power to the system. This would be the same result as if you pulled the power cord from the system. This happens when you click Turn off computer and then click Turn off.

Warm reboot is where you restart windows and it goes back into windows. This happens when you click Turn off computer, and then click Restart. Power never goes off on a warm reboot like the cold reboot does.

The advantage of Cold reboot is that it releases anything that is stuck in memory. If you are getting error messages or other issues, it might be because something is stuck in memory. When you do a cold reboot, it clears the memory. A warm reboot doesn't release items stuck in memory. Only a cold reboot does.

The only thing a warm reboot does is for installing software. Software sometimes requires modification of a system file. The system file cannot be altered if it is in use, the install program will update it when you restart (warm boot) the computer. When it reboots the system file is not in use and is able to be updated.

What is Green Computing

Green computing, also called green technology, is the environmentally responsible use of computers and related resources. Such practices include the implementation of energy-efficient central processing units (CPUs),servers and peripherals as well as reduced resource consumption and proper disposal of electronic waste (e-waste).

One of the earliest initiatives toward green computing in the United States was the voluntary labeling program known as Energy Star. It was conceived by the Environmental Protection Agency (EPA) in 1992 to promote energy efficiency in hardware of all kinds. The Energy Star label became a common sight, especially in notebook computers and displays. Similar programs have been adopted in Europe and Asia.

Government regulation, however well-intentioned, is only part of an overall green computing philosophy. The work habits of computer users and businesses can be modified to minimize adverse impact on the global environment. 

Start-up process of a desktop computers

1. Make sure all the cords of the monitor, CPU, keyboard, and mouse are connected in the right places.
2. Plug the power cords of the monitor and CPU to the AVR.
3. Plug the AVR cord to an outlet.
4. Switch on the AVR. You will see a red light button after you switch on the AVR. 
5. Switch on the computer.
6. Switch on the monitor.   

Usage of Bluetooth, Wi-Fi and NFC

Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances from fixed and mobile devices, and building personal area networks(PANs).

Usage of Bluetooth

• Wireless control of and communication between a mobile phone and a handsfree headset.
• Wireless communication with PC input and output devices, the most common being the mouse, keyboeard and printer.

• Three seventh and eight generation game consoles, Nintendo's Wii. and Sony's PlayStation 3, use Bluetooth for their respective wireless controllers. 

 

Wi-Fi

Wi-Fi is a local area wireless technology that allows an electronic device to exchange data or connect to the internet.A Wi-Fi-enabled device can connect to the Internet when within range of a wireless network which is configured to permit this. The coverage of one or more access points—called hotspots—can extend from an area as small as a few rooms to as large as many square kilometres.

 Usage of Wi-Fi

• Personal computers 
• Smartphones
• Digital cameras
• Tablet Computers

 

 

NFC

Near-field communication (NFC) is a form of short-range wireless communication where the antenna used is much smaller than the wavelength of the carrier signal. In the near-field, the antenna can produce either an electric field, or a magnetic field, but not an electromagnetic field.Thus NFC communicates either by a modulated electric field, or a modulated magnetic field, but not by radio (electromagnetic waves).

Usage of NFC

• Used in social networking situations, such as sharing contacts, photos, videos or files.
• Used in video games
• Used in credit cards and electronic ticket smartcards, and allow mobile payment to replace or supplement these systems.

Keep Your Home Computer Safe

Check Your Firewall

If you own a Windows-based system, just go to your control panel and type “firewall” in the search box. If your firewall is “on” or “connected,” then you’re good to go. If you own a Mac, click the Apple icon on your toolbar, go to “system preferences,” then “security,” then “firewall.” Making sure you have a firewall in place can go a long way toward keeping criminals out.  

Back Up Your Data

Backing up your data protects you in the event of a computer crash or electrical outage or surge, like a lightning storm might produce.If you don’t have a significant amount of data to store, use a service like Dropbox, where you get 2GB of storage for free.

 

Stay Away From Rogue Websites

Be careful when shopping at a website that ships items from overseas, and don’t click on links sent to you in email messages, go directly to the website itself instead. 

 

Avoid Deals That Are Too Good to Be True

If you see a deal for 90% off The Beatles Collection CD, it very well could be a knock off. Even worse, some sites are known to lure customers in with an amazing deal, and once they have your credit card information they’re never to be heard from again – your identity may be compromised and there’s not even a product to show for it.

 

Never Divulge Sensitive Information

No matter what website you’re on be careful of the sensitive information you reveal.Revealing information as innocent as your pet’s name or mother’s maiden name could lead to identity theft, because you probably use the same data as the security question on some other website.

  

Avoid Opening Unknown Emails

Never open an email from an unknown or suspicious source, and definitely never open any attachments contained in them. You have to be careful of emails coming from people on your contact list as well, especially if the sender’s account has been hacked. If an email from someone you regularly communicate with has a suspicious link and unusual content, delete it and immediately alert this person that his or her account may have been compromised.