The Windows Hardware Compatibility Test (HCT) version 11.0 kit can be used immediately to test devices and systems to obtain the "Designed for Windows" logo for the Windows XP Professional and Windows XP Professional with Service Pack 1 (SP1) operating systems. The HCT version 11.0 kit is designed to enable beta testing of devices and systems for compatibility with the Windows .NET Server family of operating systems, RC1 or later release.