What is iMovie doing after update? How can I tell when it's done?

Question

"Updating" a whole lot of old iMovie events to the new iMovie 10 library.
When I tried to trash the old events the OS warned that they were "still in use".  No problem, I thought.  Shut down iMovie, and then trash the old events.
Well, when you try to shut down iMovie it tells you there are still "tasks being completed in the background" and that if you shut down they won't ever be completed.
so......
What are these tasks?  (iMovie 10, after a big import, is using about 20-25% of a CPU continuously, according to Activity Monitor)
If I do shut down despite the warning what are the consequences?
How can I tell when it's done and I can safely shut down iMovie? (I guess I sould wait and see if it ever stops warning me).

Answer 1

Did you read the manual? It's usually explained on what does all this stuff mean on the screen. I don't think the manual that comes with the Micro isn't the player's guide but if you install the software I think, you can look it up by going through Start>Program Files>Creative>Creative Zen Micro>User Guide. This is the default directory.
Anyway, yes your Micro is charging and if you want to play your music on your MP3 player while it's charging you can use Nomad Explorer to play the music on your computer or use Creative Mediasource to play the music and hear it from your MP3 player. You can't control your MP3 player so just use your computer. It's not that hard to learn.