The "Administrator's and User's Security Guide for Windows NT 4.0" is the official document that specifies the exact procedures to configure Windows NT 4.0 as a Trusted Computer System Evaluation Criteria (TCSEC) C2 compliant system. This guide is available from the following Microsoft Web site: These procedures include the installation of Windows NT 4.0 Service Pack 6a and a Post-SP6a hotfix called the "C2 Update."

The C2 Update corrects the following problems in Windows NT 4.0:

•	NetBT disallows unprivileged user mode programs from sharing TCP and UDP ports that are opened by NetBT. For additional information, click the article number below to view the article in the Microsoft Knowledge Base: 241041 (http://support.microsoft.com/kb/241041/EN-US/) Enabling NetBT to Open TCP and UDP Ports Exclusively
•	Device drivers create their corresponding DeviceObject with FILE_DEVICE_SECURE_OPEN DeviceCharacteristics. For additional information, click the article number below to view the article in the Microsoft Knowledge Base: 243405 (http://support.microsoft.com/kb/243405/EN-US/) Device Drivers Create Their Corresponding DeviceObject with FILE_DEVICE_SECURE_OPEN DeviceCharacteristics
•	Jet500 creates events and semaphores objects with non-NULL ACLs. For additional information, click the article number below to view the article in the Microsoft Knowledge Base: 243404 (http://support.microsoft.com/kb/243404/EN-US/) ACLs Associated with Events and Semaphores Created by JET500.DLL

The following files are available for download from the Microsoft Download Center:

English (US) (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=15927)

English (US) (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=15928)

Chinese (Simplified) (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20508)

Chinese (Simplified) (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20508)

Chinese (Traditional) (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20510)

Chinese (Traditional) (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20510)

Danish (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17366)

Danish (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17367)

Dutch (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17360)

Dutch (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17361)

Finnish (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17368)

Finnish (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17369)

French (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17551)

French (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17552)

German (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24332)

German (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24332)

Hungarian (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17372)

Hungarian (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17373)

Italian (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17356)

Italian (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17357)

Japanese (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20505)

Japanese (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20505)

Japanese (NEC):
Download Q244599n.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20505)

Korean (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20507)

Korean (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=20507)

Norwegian (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17364)

Norwegian (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17365)

Polish (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17374)

Polish (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17375)

Portuguese (Brazil) (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17362)

Portuguese (Brazil) (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17363)

Russian (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17376)

Russian (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17377)

Spanish (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17553)

Spanish (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17554)

Swedish (x86):
Download Q244599i.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17358)

Swedish (Alpha):
Download Q244599a.exe now (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17359) For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file. NOTE: The C2 Update also includes the binary files required in the Spooler-fix described in the following article in the Microsoft Knowledge Base: