Microsoft Windows XP Peer-to-Peer Downloads
The new Windows XP Peer-to-Peer SDK and the related Advanced Networking Pack for Windows XP will help developers create advanced networking applications. The SDK provides documentation and sample code while the Pack adds advanced networking support to the XP client, including enhanced IPv6 support, APIs for Peer-to-Peer name resolution, network graphing, grouping, and identity management. This SDK will help developers to create decentralized applications that harness the collective power of edge of the network PCs.

Microsoft Windows XP Peer-to-Peer Software Development Kit (SDK)

http://www.microsoft.com/downloads/details.aspx?FamilyId=5116A614-A487-4DFF-B384-829CD8CE977D&displaylang=en

The Windows XP Peer-to-Peer SDK provides documentation, sample code and other tools that allow developers to build peer-to-peer applications or services that capitalize on the new Advanced Networking Pack for Windows XP available for users.
Note: In order to run applications built with the Windows XP Peer-to-Peer SDK, the Advanced Networking Pack for Windows XP must be installed.

Date: July 23, 2003

Microsoft Advanced Networking Pack for Windows XP

http://www.microsoft.com/downloads/details.aspx?FamilyId=E88CC382-8CE6-4739-97C0-1A52A6F005E4&displaylang=en

The Advanced Networking Pack for Windows XP is a set of platform technologies designed to run on Windows XP to enable the use and deployment of distributed, peer-to-peer applications based on Internet standards. The update includes a new version of the IPv6 stack, including support for NAT traversal for IPv6 applications. An IPv6 firewall is included to protect the end-user's machine from unsolicited IPv6 traffic, while the peer-to-peer platform makes it simple to write distributed solutions.

Date: July 23, 2003

http://msdn.microsoft.com/library/default.asp?url=/downloads/list/winxppeer.asp