This point was touched, but not detailed. If you are carrying a presentation to be run on some other system, make sure that you use the basic fonts/ bullets etc, not the fonts downloaded on your system.
In many scenarios you would like to leave soft copy of the presentation behind with the audience but would not like them to use the matter. There is a simple way to stop this from happening. You can save the presentation as "PowerPoint Show" (.pps) from the 'Save As' option that creates an executable show.
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