A unified distributed real-time quota limitation system limits use of shared networked resources in distributed networked environment (DNE). A dispatch center determines an amount of shared resources available to client devices in the DNE. The dispatch center determines an amount of the shared resources to allocate for use by the clients, and sends the clients one or more policies having a resource usage quota that limits the amount of the resource that the client can use. When a client receives a request to perform a task that requires a shared resource, before running the task, the client determines its own usage of the resource and terminates the task if running the task will exceed the quota limit of the shared resource.