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There are several ways to accomplish this:

The ns parameter in a <node> tag in a launch file sets the namespace that the node runs in: http://wiki.ros.org/roslaunch/XML/node (You could also use many other tags that let you specify a ns attribute, e.g., the <group> tag)
You could also use the ROS_NAMESPACE environment variable.
You could use the __ns "special key" remapping argument with rosrun

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