Aperture on multiple computers

I just got an air and would like to be able to access my aperture library on my imac. What are my options? I have mobileme, and my aperture library is 3.3 gb, so is it possible to share using idisk? One thing that confuses me about aperture is where the files are stored. Is it the aperture library that needs to be shared, or just the entire pictures volume?

Thanks in advance.