protocol questions

[Alex Nicolaou]

If the client never requests some portion of the screen, is the server
guaranteed to never send it?

On a related note, does the server keep track of which parts of the client
are up-to-date for purposes of copyrect messages? If half of the screen is
left unupdated for a long time, will the server still be able to use bitmap
fragments from that part of the screen (which are still there in the
client's state) even though those bitmaps aren't there from a fully
up-to-date point of view?

thanks
alex