Abstract: A simplified graphical user interface display unit which enables the user to view and change cache size relative to received cached documents and also to enable the user to track a sequence of received documents or a sequence of other computer controlled events. A data processor controlled receiving display station for receiving Web documents has apparatus for storing a sequence of received Web documents, tracking the sequence cf stored Web documents in combination with a displayed graphical unit including: a sequence of nondescriptive markers corresponding to the sequence of stored Web documents and a user interactive implementation for stepping sequentially through the sequence of markers.