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roslaunch cannot spawn multiple roscores, so it sounds like something else is going on.

It sounds strange that you say you are using <machine> tags inside of nodes. You cannot use a <machine tag=""> inside of a <node> tag. You must use the machine attribute.

http://ros.org/wiki/roslaunch/XML/node

roslaunch cannot spawn multiple roscores, so it sounds like something else is going on.

It sounds strange that you say you are using <machine> tags inside of nodes. You cannot use a <machine tag=""> inside of a <node> tag. You must use the machine attribute.

http://ros.org/wiki/roslaunch/XML/node

EDIT: also should add, roslaunch has no capability to launch roscores on remote systems, so if there is one running remotely, it did not start it.