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Nothing spectacular: roslaunch will detect that a roscore instance is already running and use that (instead of starting a new one).

From the roscore wiki page:

NOTE: If you use roslaunch, it will automatically start roscore if it detects that it is not already running.

Nothing spectacular: roslaunch will detect that a roscore instance is already running and use that (instead of starting a new one).

From the roscore wiki page:

NOTE: If you use roslaunch, it will automatically start roscore roscore if it detects that it is not already running.