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Most robots use topics for sending periodic or continuous commands to motors and actuators.

The tutorial gives a good overview of topics: http://wiki.ros.org/ROS/Tutorials/UnderstandingTopics

And this turtlesim tutorial gives a more in-depth look at how to use topics to control a robot (or simulator): http://wiki.ros.org/turtlesim/Tutorials/Go%20to%20Goal

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