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Yellow dot as "laser pointer" for presentations?

• To: mathgroup at smc.vnet.net
• Subject: [mg121415] Yellow dot as "laser pointer" for presentations?
• From: AES <siegman at stanford.edu>
• Date: Wed, 14 Sep 2011 05:15:13 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

The following YouTube video 

<http://www.youtube.com/watch?v=BlkRkhg5kKs>

shows the use of a soft yellow dot as a pseudo laser pointer in a 
presentation.  First time I've encountered this; seems kinda nice to 
me.  Any easy ways to do this using standard software tool in any Mac 
presentation software, either pre-programmed into a recorded video or 
slide presentation for recorded presentations, or as a kind of laser 
pointer under control of the live presenter in a seminar or class 
presentations?