1. Introduction In this information-technology age, everyday tasks are more and more related to computer. That ranges from basic jobs such as providing food recipes for housewives to complicated ones such as analyzing laboratory experimental data for scientists and engineers. This popularity of computer means that the time one has to spend with computer would be a lot more than in the past. Until now, the computers and computer peripherals in the market have been made according to the same design as the ones invented decades ago when comput ....