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A package definition file (PDF) for Windows NT 3.51 Service Pack 4 isavailable for download in the following electronic service:
Internet (anonymous FTP) ftp ftp.microsoft.com Change to the /bussys/winnt/winnt-public/fixes/usa/nt351/ussp4 folder. Get NT351SP4.PDF
The Service Pack 4 UPDATE.EXE has been modified to include new switches.They are as follows:
/f Unattended install, forcing applications to close (overrides /u) /u Unattended install, do not force applications to close /x Wait for SETUP to complete before exiting UPDATE
Administrator privileges are required to run UPDATE.EXE. It is possible torun UPDATE.EXE using AT.EXE and a user account on the system withadministrator privileges.NOTE: After you apply Service Pack 4 (SP4), you cannot go back to theprevious version or Service Pack because SP4 makes several changes to theregistry and the SAM database. Therefore, it is strongly recommended thatyou have a working backup of the Windows NT system directory and registrybefore you apply SP4.
If you have Compaq SSD version 1.15 (or earlier) already installed, you mayencounter problems after you apply Windows NT 3.51 Service Pack 4. Tocorrect or prevent this problem, apply the latest Compaq SSD before you runthe Service Pack 4 UPDATE.EXE.