Re: How to restrict 1 login per user at a time in windchill.
I don't think you can as there is no mechanism to do the checking built into the authentication process.
Are you using a SSO or Windchill DS?
Do you really want to do this? I use Windchill in a browser and inside Creo frequently. Restricting login to 1 per user id would require me to log out of one to access the other from my same desktop. Not productive at all!