>When I open a certain form, close it, and attempt to open it again I get the following message:
>“Only one copy of this form can be run”
>
>I figured that I would do a code reference ‘scan’ for that phrase, and start looking at code, properties etc. Trouble is I can find the phrase in the code, where might it be? And why can’t the code reference utility ( of 8.0 ) find it? Plus the explorer search cannot find it either.

As Hilmar said, there's a form property preventing this - lAllowMultipleInstances. You'll find that message either in strings.dbf or msgsvc.dbf.

Chris.