One of the great advantages of the personal digital assistant is that it's small and portable. Its great disadvantage is that it's difficult to enter data with a stylus.
That fact has led to a parade of curious and occasionally truly innovative add-on keyboards that fold up, slide or are built in to handheld PDAs and wireless phone-PDA combos. But now it seems that the keyboard itself may not have to take physical form in order to be useful.
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