For NT network you can use Who opened what files on the network? (modified to use only VFP code) FAQ #7896.

>Is there a way in VFP 6.0 to determine what users are in our application? We test for EXCLUSIVE use of the database when updating tables which works great, but it would be better if we can identify specifically who is still in the application.
>
>Thanks,
>
>Bryan
>for Rudy Nieves