Is there a way to detect 2 key presses at once?

Hey guys,

When I say two keyboard presses, I’m thinking about a situation where I would need to detect both. Not a shift this or alt that or control third. I’m talking about **Down + A **or 5 + T. For instance: Ryu has an overhead attack that is used when both Down + MP are pressed. If I were to create a game, with ActionScript 3.0, is there a way for me to detect that both buttons were pressed at the same time?