I've been reading comics off and now For a few years. I usually stick to TPBs, but with a recent purchase of an iPad I started to purchase weekly. I do have one major question. How does a character in multiple books work? For example, last week in Amazing Spider-Man, Sidey was fighting with the Avengers on the coast of the Mediterranean fighting the Sinister Six. Now this week, he's back on Utpoia. Another example is AvX #1 and this weeks Uncanny X-Men. Can someone please shed some light on this please.