About six years ago I was starting to get into 4th Dimension (on the Macintosh) and was setting up a multi-user database for a client. I got everything setup as a single user system for the customer because they didn't want to allocate resources to the database until debugging was through, etc. So, all was fine and dandy as a single user system. The customer called me back three days later and was very frustrated trying to get multi-user working. Everything seemed ok in his setup, but he couldn't use both "machines" at once because the other user kept "messing up the screen."
Turns out that he just plugged two keyboards into the same Macintosh and thought that meant multi-user.
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