A method for enhancing allocation of fluid flow rates among a plurality of wellbores coupled to surface facilities is disclosed. A beam splitter is located in the beam near a pupil plane. The promotions management system receives a query from a vendor system requesting promotions to be shown to a user browsing a particular item at the web site of the vendor. A bleed valve is provided to control crystal velocity without controlling crystal density, while a bypass valve is provided to control crystal density without controlling crystal velocity. The identifier can be stored on a datastore, such as a radio frequency identification tag attached to the entity. The asset list identifier is stored for later retrieval.