Fred, could you create these as slimserver bugs in future, instead of
bugs.slimdevices.com.  thanks :)

Will do. Sorry the distinction somehow escaped me... Must learn to read web pages better, I guess...

np.  I think I only just realised I hadn't mentioned it before :)

Fred, what's the plan for this?

6.5 I guess

In addition this would require a subscription mode, from the forum 

"The room is mostly a showroom for selling audio gear (so the SB is going to be on display to a lot of high end speaker and amp customers - that ought to be good for SD's business.) When I'm at my laptop, I can't see the SB display. I'd like my laptop to be able to tell me, moment by moment, what the SB is displaying to my customer. It's obvious the server keeps track of every display change, but it doesn't announce them."

http://forums.slimdevices.com/showthread.php?t=15674&page=3

Added "show" that gives somewhat better control on displaying a message than "display" does.
Now this bug is also about queries and nothing has been done yet on queries.