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Concepts of rosparam and rosservice

I'm going through this tutorial (http://www.ros.org/wiki/ROS/Tutorials/UnderstandingServicesParams) and am unclear about one thing. After setting a new parameter (rosparam set background_r 150), why we need to call clear service (rosservice call clear) to make the change take effect?

How do they work? Thanks!

Concepts of rosparam and rosservice

I'm going through this tutorial (http://www.ros.org/wiki/ROS/Tutorials/UnderstandingServicesParams) and am unclear about one thing. After setting a new parameter (rosparam set background_r 150), why we need to call clear service (rosservice call clear) to make the change take effect?

How do they work? Thanks!

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Concepts of rosparam parameters and rosserviceservices

I'm going through this tutorial (http://www.ros.org/wiki/ROS/Tutorials/UnderstandingServicesParams) and am unclear about one thing. After setting a new parameter (rosparam set background_r 150), why we need to call clear service (rosservice call clear) to make the change take effect?

How do they work? Thanks!