>>>On a network. Everyone has their own resource file that has their userid in the file name. Unfortunately I did not forsee that some users might attempt log onto the system more than once. For various security reasons, they are not allowed to do this. But my setting of the resource file to their useridresource file gets them multiple messageboxes. the useridresource file is already being used.
>>>
>>>How can I know that a file is already being used?
>>>
>>>Brenda
>
>>In config.fpw SET RESOURCE OFF.
>>Very early in main.prg:
>>OldOnErr = ON('ERROR')
>>FileInUse = .F.
>>ON ERROR FileInUse = .T.
>>USE UserIDResource.dbf EXCLUSIVE
>>ON ERROR &OldOnErr
>>IF m.FileInUse
>> QUIT
>>ENDIF
>>USE IN UserIDResource.dbf
>>SET RESOURCE TO UserIDResource.dbf
>>SET RESOURCE ON
>
>What does the last "set resource on" do?
>
>Brenda

Um ... turns resource on ... I'm not sure I understand the question.

The line in config.fpw turns RESOURCE OFF, in other words, tells (Visual) FoxPro not to use a resource file at all. After you've determined that you'll be able to open it, you need to tell FoxPro you want to use it (as a resource file) after all.

A resource file is just a special dbf. (V)FP uses it internally in a special way. (To save and restore certain settings.) But you can tell (V)FP not to use it (which turns off the saving of the settings which it saves there) or tell it to use it. By default, it uses it.

HTH,
Rich.