Sharing a Computer with friends is problem both for security of information and safety and welfare of your computer.
I have owned about 10 computers laptops in my Travel Life, and two of the major problems occurred because I loaned the computer to friends.
One time in Koh Phan Ngan, Thailand I loaned the computer to a friend, he was drinking beer and spilled a drop into the keyboard, successfully killing the motherboard.
Generally, if you loan a computer to a friend, it will come back to you with photos, programs and unwanted information.
The number one reason they wish to borrow or use is to arrange their photos, I never allow this because they put specific software needed for their camera. Then they wish to burn DVD or other mass memory devices.
The rule of thumb is this, if a friend wants to use your computer, you perform the task for the person, do not allow them to work on your computer, this is the only safe strategy.
The modern world is growing at a rapid pace. 30 years ago, no one even knew what the Internet was, and few people had access to a computer. In todays world the internet technology has revolutionised the way that we spend our time, from internet TV to internet shopping and on-line games. A lot of the shopping we do can be completed online and paid for from the comfort of our own home, and the choice of products and suppliers is endless, we can now place an order with a supplier on the internet, pay for it and have it delivered the next day, Next day parcel delivery from internet shopping has now become a way of life, and is taking over from the traditional high street, with no parking problems and no walking around in the rain,
With the internet has also come the demise of the "Yellow Pages" no longer do we look in the "Yellow Pages" for services or products, we just go to a search engine like "Google" enter the product or service we require and we get a list of may be 1,000,000 suppliers from all over the world, with each supplier providing us with prices, descriptions and images of the products and giving us a much wider range of choice than we would have had 30 years ago.