>Does anyone know what VFP is doing at the OS level when an RLOCK is issued?
>
>I've been trying to find an answer to the question "Who has locked this record" in a multi-user NT based system so that I can monitor the locks.

That may be a tough one to do in that way, you're looking more at SQL Server type of DB for that. However, I have done this sort of thing in vfp in a home-made way - when a user locks a record, you can write username and PK (and table if necessary) to a tracking-table on server, not difficult to do.