If a record lock is issued just prior to tableupdate(), will it refresh the buffered data ?

Example: A form has table A and Table B in the DE with opt. row buffering. The user seeks a record in table B and then does some work with table A. When the user is ready to exit, a single field needs to be updated in the current record in table B, I am thinking a record lock (refreshes buffer in case another user has made changes) then the replace of single field, and then tableupdate(table B). I need table B with opt. row buffering in this form for other functions of the form or I would open B with no buffering and use record lock.

Thanks CB