Thankyou for the prompt responses.
So the answer is no, there is no manual screen refresh. Maybe this could be a future addition.
I am using legacy capture mode on the hosts, otherwise when the laptop lids are closed, the communication is lost.
I am also not sure whether the Beta viewer will run on XP.
When using remote install, should the viewer should be updated first or last. ( 2 viewers and 2 hosts).