How to make an image appear as different things to different people?

I am creating a multiplayer poker game, and I want the player to be able to look at their own cards, while the cards appear face=down to everyone else in the room.

How would I do this?

Generally by determining whether a card is owned by the local player and if so, draw the front face of the card, otherwise the backface.

Broad question broadly answered. :wink: