Basic doubts about RFB protocol

[Jagrothu Srikanth-A19454]

Hi,
	Iam totally new to this VNC. Recently I have been going through RFB protocol.
RFB says its a demand driven protocol i.e. Server will not send any FrameUpdates unless Client has requested for.
But lets say , Server has shared a powerpoint presentation with Client. Server has moved the presentation to next slide.
How does Client know that Server has gone to next slide and request for a FrameUpdate?
Does Server itself sends FrameUpdates in this case?

please let me know about these...

thanks & regards,
Srikanth