1. A physical computer program product comprising one or more physical computer-readable media having thereon computer-executable instructions that are structured such that, when executed by one or more processors of a computing system, the computing system is caused to instantiate in memory the following: a data stream object associated with a data stream, wherein the data stream itself is not entirely within the memory of the computing system although the data stream object is within the memory of the computing system, wherein the data stream object is configured to respond to requests for a portion of the data stream object by performing: an act of identifying the portion of the data stream requested; an act of accessing at least the identified portion of the data stream, but not the whole data stream; an act of providing the identified portion of the data stream; wherein the identified portion of the data stream is used in a data-driven model in which one or more view components use the data from the data stream to render visual items on a display.