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1. The Internet standards are specified in a series of documents called RFCs, or Requests for Comments, which are available on the Internet. Contact

2. These numbers are from the international connectivity data collected by Larry Landweber and provided by the Internet Society as a part of its Web information collection. See

3. All Internet standards are published for use in any way without any constraints or license. This perhaps represents the most open form of "open."

4. CSSP [3], p. 16, example 3A.

5. CSSP [3], p. 17, example 3E.

6. Note that this proposal does not support the interworking of an SNA application with an Internet application. By our definition of interworking, that would require a spanning layer specific to each pair of applications to be interconnected. The goal here is more modest: to take existing applications from either protocol suite and support them over a new spanning layer that allows them to sit above both TCP and SNA.

7. There are examples where a spanning layer tries to avoid a common address space by supporting multiple address spaces or by translating among several. These approaches are often complex.

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