Forum:Flip summon confusion

Quick easy 2 questions for you pro's out there =].

Flip summons can only occur when a face down defense position becomes flipped into face up attack right? (Or when they are attacked in face down defense position. Can you flip from face down attack position into face up attack?

Also, if you have 3 monsters on the field and only one of them if in face up atk position (the rest are in face down attk position) can you only attack with the monsters you flip? and does this count as a flip summon?

thx.