[Xymon] how to configure xymon server receiving summary info from another xymon server?

Let's say server a has in its hosts.cfg

summary a.All 12.34.56.78 https://a.foo.com/xymon/

How will server b (12.34.56.78) have to be set up to display that overall status? Am I correct in thinking that would that appear as a line with one dot if that's the only summary from "a" being sent to it?