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Network Booting Microsoft Windows Preinstallation Environment
http://www.vistaarticles.com/articles/197/1/Network-Booting-Microsoft-Windows-Preinstallation-Environment
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Published on 12/9/2006
 
Microsoft Product Support Services (PSS) provides for network booting the Microsoft Windows Preinstallation Environment (Windows PE) 2.0 product.
Network Booting Microsoft Windows Preinstallation Environment

This article discusses the support boundaries that PSS provides for Windows PE 2.0 and describes methods for network booting Windows PE 2.0. This article specifically addresses the Pre-Boot Execution Environment (PXE) network boot technology. It does not encompass other network boot technologies that perform block-level I/O over a network connection, such as the Internet small computer system interface (iSCSI) boot technology.

Details: http://support.microsoft.com/kb/926172/en-us?spid=11732&sid=global