2. A method according to claim 1 further comprising the step of: in response to an indication of a displayed document being received by the computer system, removing from display any and all preview documents deriving from the indicated document.
2. A method according to claim 1 further comprising the step of: in response to an indication of a displayed document being received by the computer system, removing from display any and all preview documents deriving from the indicated document. 3. A method according to claim 2 further comprising the step of: caching a preview document which has been removed from display.