10. Gadgets vs Robots Robot Gadget Runs on application servers (currently AppEngine) and interacts with the wave over a protocol. Runs within the wave client itself. Each robot may instantiate at most one instance per wave. Remember that a robot is like a participant on a wave, so each participant/robot is a unique instance, but a wave can have many participants/robots. Each gadget may have multiple instances per wave, one for each participant interacting with the gadget. Robots may modify a wave and perform the same operations as a human participant. Gadgets are not able to modify a wave, and have limited visibility into the wave. A gadget is only able to detect changes in the wave's participants. Robots can modify a gadget. Gadgets have no way to know that a robot exists, and thus are not able to modify a robot.