I have lost my Windows NT Installation CD-ROM case that had the key number, so how can I find out what the number is?

A. The easiest method to determine the key number is to run winmsd. From the Start menu, select Run, then Winmsd. Look at the Version tab, and on the line above the register information, you’ll see a number in the form of 50036-xxx-yyyyyyy-71345. The xxx-yyyyyyy is the number on the back of the CD-ROM case and is also the same number as the registry entry HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsNTCurrentVersionProductId.