Windows Longhorn/6.0.4050.private/lab06 demo.031019-1809

Windows "Longhorn" build 4050 (with a build tag of 4050.private/lab06 demo.031019-1809) is a build of Windows Longhorn. This build was shown during Microsoft's Professional Developers Conference of 2003 to demonstrate some of the new features enabled by the WinFX set of application programming interfaces (APIs).