The trend in wireless terminals has been to shrink a general-purpose desktop PC into a package that can be conveniently carried. Even PDAs have not ventured far from the general-purpose model, neither architectural nor in terms of usage model. Both the notebook and the personal computer generally use the same standard PC operating system such as Windows (CE) or Unix, same applications, use the same communication protocols and use the same hardware architecture. The only difference is that portable computers are smaller, have a battery, a wireless interface, and often use low power components [2].
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