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If you are talking about the "clock model" in diamondback, as of electric, the "clock model" has been removed from the world file. The gazebo binary built from gazeboros.cpp contains a publisher for /clock and various services such as the model factory for spawning models. In fuerte, the model is slightly shifted as all ros related topics/services are now available there through system plugins, invoked by loading them with the -p option when starting up gazebo.

In terms of "controlling the speed of simulation", can you explain in more detail what you mean by it? Thanks.