Ctrl2Cap by Sysinternals, now part of Microsoft, changes the function of the Caps Lock key into a Ctrl key in Windows NT4 and NT5 (2000), The original version of the utility left the original Ctrl key dead unlike most utilities which change that into a Caps Lock, it isn't known whether this is still the case with version 2.0 of the program. Version 2.0 added an install and uninstall function. The program is available free of charge from Microsoft Tech Net.