1. How do you want the movie clip to stop?
In PowerPoint 2002/XP and above:
You can set it to stop by Add Effect > Movie Actions > Stop.
Then, set the start to With Previous.
Next, right click on the stop effect and select timing.
Adjust the delay to your preference. For example, if you set 5 seconds
delay, the movie clip will stop after 5 seconds automatically.
2. You can't. You will need to go through the animations from the beginning
on a particular slide. If you have many animations added, one way is to split
the animations onto two slides or more.
I have a sample tutorial here which you can check it out:
"Slide-By-Slide Animations"
http://pptheaven.mvps.org/tutorials.html#SBSA
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Microsoft Most Valuable Professional (MVP PowerPoint)
Site Updated: April 13, 2006
Added new portfolio
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate