Help with logic filtering of message

Colin,

Ok, with the join node working and set how you say I get alternate outputs of both machines with their messages.
Though it (from my example above) I am getting:
Machine1 modem online
Machine2 modem online
Machine1 modem online
and so on.

(by edit)
Ok, looked at it again a bit harder, but gee it is difficult to see the difference.
(I am not getting it.)
I can't see how that is useful.

Paul:
Thanks.

That looks interesting.
Seems I have to (maybe) learn about that language/syntax now too.