PE Builder v3 plugin
With this plugin you can get the shutdown.exe command line tool from your XP CD-ROM on your BartPE CD.
Also included are shortcuts for nu2menu and Sherpya's XPe to the graphical shutdown dialog that is included at least with the version of shutdown.exe that ships with Windows Server 2003 SP1 (R2). If you run this version from the menus, the command line window will stay on the screen until you press a button; this is so that you can read any messages (such as errors) printed by the shutdown.exe tool before the window closes.
This tool is not intended to be used to shut down the BartPE system itself; instead you should use this to shut down another system on your LAN. To shut down a remote system, first try to use some share from the system you're about to shut down, log in with an account with administrator privileges, and only after that start the shutdown utility.