A license key to run GeoModeller or Intrepid is called a "cookie".
The cookie is located at C:\Users\<User>\AppData\Roaming\Intrepid Geophysics\.intrepidlock
Cookies can be version locked, date and time locked and also have keys for optional features. If you are running Windows or Linux you may be using a dongle.
Computers equipped with a network card may have dongle-less licenses issued to them.