Environments such as home, business, networking, communication, etc.
-access to remote information: People used to have computer at home for example to be informed of what is happening around the World. This can be made by internet. Some people when they are in their native country or when they are abroad, they use computer to have some information about their country. For example, if an American lives in France and he wants to have information about Presidential election in USA, he can have it using computer. The remote access enables people to connect to a computer network form any location using another computer .as long as you have access to the internet you will have the ability to work remotely. -Electronic commerce: in this area of computer, we can use person to person (peer-to-peer) communication. It allows two or many computers to share files. Peer to peer describe application in which users can use the internet to exchange files with each others directly or through a server. We use it in a method called Business to consumer (B2C) . We distinguish exchanges of products, services and information between businesses. For example a fashion clothing company ordering denim from denim supplier, the director can order denim online from his home.
Fig 1: transaction processes in B2C 
2- Real time
We use computer systems in real time. Real time is a process in which people can communicate without any deadline. We can share our video while we are chatting with our friends. It is most of time use in some internet applications as Yahoo messenger or Skype.  Sometimes people use computer as a TV. We can access to live information from a television station through a computer. The picture below shows us a real time scientific calculator that is evaluating climate change. This computer tells us...