So what's the trick to register for all users? I copied the installation from one computer to another (I have a multi-machine license) and ran tcc as admin on the new computer. As expected, it came up in eval mode. I registered the software successfully using "option", exited and logged out. Then I logged in as a different user and ran tcc. It came up in eval mode. What is the requirement for getting TC13 registered "for all users" on a given system? I want to setup & register once, after which it needs to be available to all users. Is there a switch to force TC13 to use HKLM instead of HKCU for registration info?