Sensors at the midway point of the table detect the angle, speed, and trajectory of the not-exactly-oncoming puck, and instructs the mechanism how and where to fire the disc -- you slap it back, and the same sequence happens on your compadre's end.
Kim then shifts into sales-mode by pointing out that Samsung's more power-efficient 240Hz LCDs and Plasmas with highly-reflective black panels and LED edge-lighting are quickly cutting into any advantage offered by OLEDs -- including thinness if you factor in the additional electronics you'd have to slap onto the back of those 3-mm thick OLED panels to create a TV.