Virtual Machines and Types of Service for TeraGrid Computing Foundational capabilities we provide in TeraGrid, such as "roaming" access and a "coordinated" software environment, open new possibilities in terms of more specialized services, or to allow the TeraGrid, as a system, to respond to supply and demand. For example, a resource provider might elect to increase the "price" of a queue in order to improve turnaround time by reducing demand, or decrease the price to increase demand (and thus utilization).