On all agents, client.conf must contain the master machine. This is illustrated on
http://www.cendio.com/resources/docs/tag/printing_config_overview.html. However, this file name is only in the picture, the text doesn't actually talk about it! Well, later chapters does, but I believe that we need to explain this a bit better, perhaps in bold. We could even consider adding support in tl-setup to make the modification.