PNRP is a distributed name resolution protocol allowing Internet hosts to publish "peer names" and the corresponding IPv6 address. Other hosts can then resolve the name, retrieve the corresponding address, and establish peer-to-peer connections.

With PNRP, peer names are composed of an "authority" and a "qualifier". The authority is identified by the secure hash of its public key, or by a simple place-holder (the number zero) if the peer name is "insecure". The qualifier is a simple string, allowing an authority to publish multiple names for multiple services.

In peer-to-peer environments, peers rely on name resolution systems to resolve each other's network locations (addresses, protocols, and ports) from names or other types of identifiers. Peer-to-peer name resolution has been complicated by transient connectivity and shortcomings in the Domain Name System (DNS).

The Microsoft® Windows® Peer-to-Peer Networking platform solves this problem with the Peer Name Resolution Protocol (PNRP), a secure, scalable, and dynamic name registration and name resolution protocol first developed for Windows XP and then upgraded in Windows Vista™. PNRP works very differently from traditional name resolution systems, opening up exciting new possibilities for application developers.

This mail is by Ashwin.

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