Keyboard (Int 16h Int 9h or port 60h)?????????

What I want to do is read every single key that is being pressed down at any point in timefor use in a fast action game. At frist I thought that INT 16h was the answer but I've been told it's not. After a lot of reading I've picked up an few keywords 16h Port 60h

and making a tsr. Can somebody in plan english just say what I want to do so I get get on with it rather than me not knowing where to look.

Also is the an interrupt to turn off screen refresh and then turn it on again. to reduce fliker in a game.