How to get the user name etc from _dbaselock field

Anyone know how to access the information contained in the _dbaselock
field?

I have a multi-user system accesing dBase tables on the file server and
would like to notify a user with information about a locking conflict.

I can't find any information about accesing the field with the lock
information from the BDE or otherwise.

Any information or clues would be appreciated!

Rick