Personal digital assistants are among the smallest of portable computers. Often, they are no larger than a small appointment book, but they are much less powerfull than notebook or desktop computers. PDAs are normally used for special applications, such as taking notes, displaying telephone numbers and addresses, and keeping track of dates or agendas. Many PDAs can be connected to larger computers to exchange data. Most PDAs come with an electronic pen that less the user write on a touch-sensitive screen. Even though they do not include real keyboards, some of these devices provide a graphical keyboard that appears on the screen; you type by tapping the desired keys with the units pen. Depending on themodel, PDAs may include following features:
Built in microphone and speaker, enabling the user to record speech digitally.
2. Personal information management software.
3. Miniaturized versions of personal productivity applications.
Internet, fax, or e-mail software
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