MSDN

If you visit the following site, you can learn about building and deploying Windows XP Embedded with Service Pack 1 runtime images using the Windows Embedded Studio tools, including creating hardware macros in Component Designer and using deployment technologies as System Cloning, System Deployment Image (SDI), and PreBoot Execution Environment (PXE).

http://www.msdn.microsoft.com/library/default.asp?url=/library/en-us/dnxpesp1/html/XPESP1_Build_Deploy_Img.asp