[mklim]

Some games purposely designed for both or originally designed for monitors and then ported to VR might be able to, but the vast majority of them are going to rely on the headset's position in real life to move the player character in the game. If it's developed for the Vive or Touch it'll also rely on motion controllers to interact with the game world. You could look at the game on the monitor, but you'd have no way to move or actually do anything in the game.