Our goal is to provide a simple yet expressive foundation for reasoning about dynamically updateable software.In this paper, we present the details of the calculus, give some examples of its expressive power, and discuss how it might be used or extended to guarantee safety properties.Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, Power is a great resource.
No prior general-purpose methodology for dynamic updating achieves a practical balance between exibility, robustness, low overhead, and ease of use.
A novel aspect of our patches is that they consist of veri able native code (e.g.
Proof-Carrying Code  or Typed Assembly Language ), which is native code accompanied by annotations that allow on-line veri cation of the code's safety.
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