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Supporters say that the ease of use of presentation software can
save a lot of time for people who otherwise would have used other
types of visual aid—hand-drawn or mechanically typeset slides,
blackboards or whiteboards,
or overhead projections. Ease of use also encourages those who
otherwise would not have used visual aids, or would not have given
a presentation at all,
the difference in needs and desires of presenters and audiences has
become more noticeable.
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