How Excel stores username who has file opened

Hello,

I have a global question, if any one could give me advice, hints or any useful info(links)....

I have a workbook on the network. If I open the workbook and somebody else has it already opened I receive a message(see attachement) that the file is locked for editing by 'be...' (user).

I want to know how excel knows which user the file has opened. Is there a file with the user in?

(I would like to create a code that gives me the user that has the workbook opened.)

Any suggestions?

Thanks

Super! Thank you Insomniac!
Exactly what I needed.

Laudus thanks for the comment.

Gollem