Aperture, PhotoStream and Apple TV

I should probably start all my Aperture posts with

"I'm new to Aperture, sorry for asking questions that are probably in the manual, or a tutorial, but ..."

But I'm considering using it, so ...

I only use iPhoto for PhotoStream and Apple TV. I see that Aperture supports both, so I'm considering using Aperture. For orgainizing all my Photos.

What I'm wondering is can I have separate Libraries (or is it catalogs) dedicated to PhotoStream and Apple TV? Along with other Libraries for organizing the rest of my photos.

If I can, is it easy to move photos between Libraries?

Sorry to ask such basic questions. But I haven't had the chance to get through the Lynda.com tutorials on Aperture yet.

Thanks.