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Is it possible to connect, in some way, two NXT bricks that has program functions running on both. For example, Brick one would tell brick two that it is okay to start a program. Are there any sensors that could facilitate this type of communication?

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You can use the Bluetooth mailbox feature to pass messages back and forth between 2 NXTs.

If you want to use sensors, you could use the HiTechnic NXT IRLink Sensor (NIL1046) and NXT IRReceiver Sensor (NIR1032).

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