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If you run only the hokuyo node on your 'limited' CPU and have it connected with setting your environment variables correctly (look at ROS_IP, ROS_MASTER_URI and ROS_HOSTNAME). Then you can run a roscore on your laptop and visualise all data with rviz. The communication will be handles for you over the published ROS topics as a sensor_msgs laserscan msg. You want to export the ROS_IP of your limited CPU on that CPU and also export the ROS_MASTER_URI to http://<your_laptop_ip_or_hostname>:11311