A system and methodology that facilitates management and utilization of variable subscriber identifiers for protecting subscriber privacy is disclosed herein. The invention can include a projector that stores page data included in projector display data in a stack area by a stack system in which the page data corresponding to the last page is at the head and projects the pages by a projecting device based on the page data read from the stack area. The system can receive a user interface event that modifies the display of windows in the user interface. The method further includes periodically updating the displayed traded quantity to reflect the quantity during the defined time period, where the quantity is updated based on subsequent market updates that are received from the exchange for the tradable object.