Serial Number not asked for?????

[The Highlander]

I bought the game last night and got home and ran a disk defrag, and of course i hadnt done this in a while so it took all night. So i quickly installed it this morning and ran a quick game before i went to work and didnt once ask for the serial no. on the back of the manual.
Has this happend to anyone else?????

[GilJaysmith]

You only need to enter the CD key if you're playing online.

Gil ~ CA