Back in June, I thought I had ArcInfo loaded and ready to go, but there were issues. I created my blog entry and walked away for the summer.
Number one...don't remove the ESRI sentinel key from the USB drive. And number two, set-up the license manager as follows.
Click on the Configuration using Services button and then go to the Start/Stop/Reread tab and Start the server. Very simple, of course, but if you don't do this (and it's not clearly stated in the software installation instructions), then when your colleagues come back to use ArcInfo you get this unfriendly error message: FLEXlm Error: Cannot connect to license server. The server (lmgrd) has not been started yet, or the wrong port@host or license file is being used, or the port or hostname in the license file has been changed. Feature: ARC/INFO