Windows Longhorn build 4018

Windows Longhorn build 4018 is an unleaked Milestone 5 build of Windows Longhorn. This build is visually similar to 4015 (Lab06_n), and was showcased at PDC 2003 accompanied by another machine running the aforementioned build. It demonstrated the new DCE capabilities of the operating system. References to "Longhorn XP" have also been changed to simply "Longhorn", notably in the desktop watermark.