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Gadgets are specific to individual waves, not users. Unlike a Facebook gadget
Almost any iGoogle or OpenSocial gadget can run within Google Wave
A Gadget built within Google Wave can take advantage of live interaction with multiple users
Automated participant in a wave
Talk with users, interact with waves
Provide information from outside sources
Check content with in a wave
Place the conversed wave on to your website/Blog
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.