The Computer Management plug-in doesn't do it - only works with shared folders and sispalys those files open if using 'Server.
Task Manager shows processes (executables), applications, process and network data.
In both cases, they're not what am I looking for, as explained above, which is to determine what files (not just executables) are in use on a workstation and be able to kill the file lock at will.
Any better ideas?
Blue