@m3g4n – An IR emitter is just another kind of infrared emitter. They can be used with 3D TVs or with laptops that have 3D-capable graphics cards installed. Check your laptop or graphics card manual and see if either one has a built in IR emitter. If so, it might be a universal emitter and you might not need to buy another one.
If neither has an IR emitter already, go buy a universal IR emitter that will plug into your laptop. Make sure the emitter is compatible with the glasses before buying it. The manual for your 3D glasses should have a list of emitter manufacturers with which it is compatible.