These devices are designed to operate in full-duplex, so they are able to send and receive signals at the same time. It is not necessary to wait for one device to finish communicating for the other device to begin communication. Mobile computers make use of a broad change in system and application software. These operating environments range in capabilities from a barebones, graphically advanced pen-enabled DOS environment to the powerful capabilities of Windows NT. Importance of mobile computing in business1. In companies: Managers can use laptops, for example, in demanding presentations to key customers. They can get close to the latest market share information. With a little more depth, they can revisit the presentation to take advantage of this information. They can communicate with the office about possible new offers and call conferences to discuss responses to the new idea. Therefore, portable computers can exploit competitive advantages. 2. Cloud Computing:- This service is offered to save documents on an online server and you can contact them anytime and anywhere when you have an internet connection and can access these files on different mobile devices or even on your home PCs. Most of these SaaS applications have web service APIs, and most cloud data is consumed via the web