>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

Generally, you may trap for an error opening any DBF file:
ON ERROR lErrorflag=.t.
USE mytable EXCL
ON ERROR
IF lErrorflag=.t.
*** do something here
ENDIF