yes Nvidia glasses are meant to see 3D content only but you'll have to buy Nvidia 3D kit as it contains all hardware required to watch 3D content peacefully....
in that setup he has a 3D TV along with 3D vision for his comp. It only works when the PC is on. Like he said u cannot connect the 3D vision kit directly to a PS3 coz the 3D vision emitter only works in a PC environment. Even though i have 3D vison, I cannot do wat he did coz my TV does not support 3D and the steps he described will not work if u have only 1 3D monitor