Re: namespaces
Please read the documentation at ros.org.  In a search on the wiki for "namespace" the first link will give you a full explanation.

Re: turtlesim synchronization
It's not a big delay, computers are fast.  

Tully

On Thu, May 27, 2010 at 9:35 AM, Narasimhan <narasimhan1990@yahoo.co.in> wrote:

in the tutorial
http://www.ros.org/wiki/ROS/Tutorials/UsingRxconsoleRoslaunch
UsingRxconsoleRoslaunch

"You will see the two turtlesims start moving even though the publish
command is only being sent to turtlesim1. "
the picture shows that there is a delay between the two turtlesims. but for
me both the sims are synchronised without delay. which is correct?
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Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827