This is probably a stupid question, but here goes anyway ... I was thinking of buying an Apple TV. One of the main ways I'd use it would be to use airplay mirroring to watch movies from my MacBook Air on the Apple TV (for example MKV movies that are not supported by Apple TV ... I know, I know, but I dont want to spend time/effort converting formats). However, I only have satellite broadband with very low download limits of 10gb/month. I'm already hitting those limits. So here is my question ... will using airplay mirroring between the MBA and Apple TV use up my bandwidth allowance? Or is bandwidth used up by actually downloading from the Interwebs??? Apologies if this is a stupid question, but I cant find the answer anywhere.