Hi,
Go to Slide Show > Set up Show, and under show options,
tick the Loop continuously until 'Esc".
If you have more than one presentation, and want to link and loop them,
Check the looping tutorial here: http://www.awesomebackgrounds.com/powerpointlooping.htm
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==================== http://www.pptheaven.xs3.com
PowerPoint Heaven - The Power to Animate
Contains tutorials on creating amazing animations for your PowerPoint
Presentations.
====================