SO I was looking around on some of the exchange site and others.

some of them ask for the address that you are sending your information from - when you pay them. I thought this was not really important , and that it was a hard to get?

so lets say I sent 1 bit coin to someone would they "see" that is came to me .. or only that one coin came in to there address, and not know who it came from.

Sorry to be so noob, just a little confused on the mechanics of sending and recieveing.