It took me a while to work out how to send my Gatherables data to another plaer (infact I only worked it out once I read the code), so it would be a good idea to display a notice saying that the other player needs the Gathereables Report window open. I've attached a patch that adds a message to the GATHERER_REPORT_TRANSMIT popup. There might be a better place for it, but that was by far the easiest to add. Patch against trunk as of 4 April 2008