Sony vegas and adobe after effects help?

1. What is rendering in vegas 8 pro and what is it used for?

2. How is a VERY GOOd and easy way to like make ur songs go with music like in a montage.

3. If I edit a video with after effects, how can I than reopen what I edited in like windows movie maker

it saves it as like a .aep or sumtin and i cant.
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