On Thu, Jun 17, 2010 at 5:02 AM, Bill Morris wrote: > How is the startup order controlled in a launch file? As far I can tell > the timing and order is intentionally indeterminate, so the nodes > parameters may not be set until the node is launched. Is this correct? No, parameters are always set before *any* node is launched (unless you launch un-named nodes, which generates a warning). One of the reasons for requiring a 'name' attribute on all nodes is so that this guarantee can be provided. - Ken