> WinPE (Microsoft's tool Windows Preinstallation Environment) is used by system builders to install and configure the Windows operating system on new computers. WinPE is commercial software and only available for system builders. Bart Lagerweij saw the advantages of this tool and decided to develop his own PE, named BartPE.
From the http://www.optimizingpc.com/miscellaneous/manual_bartpe.html page linked above:
> WinPE (Microsoft's tool Windows Preinstallation Environment) is used by system builders to install and configure the Windows operating system on new computers. WinPE is commercial software and only available for system builders. Bart Lagerweij saw the advantages of this tool and decided to develop his own PE, named BartPE.