Though born from the ashes of traditional hosting models, software as a service differs fundamentally from its predecessors. Its software is designed to be delivered as a service, security is better, rich user interfaces are available, and it has greater interactivity.
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or tightly integrated applications add further complexity. In the future, these applications will increasingly be made of dynamically linked components and services, and some will be used almost continuously, while others only occasionally. To measure such usage, one might envision central billing engines that can measure hundreds of services, and are similar to current mobile phone billing systems, which can meter calls based on usage across a network of many suppliers, but this system has yet to be