We have a standard build on our PC's that returns a generic user on excel if
people havent updated their User Name details in the 'Tools', 'Options',
'General' tab.

I want to be able to capture the users NT logon and write this to the user
name field in excel so that it stores this permanantly whenever they open
this workbook.

I have tried to google etc but cant see anything that updates this field but
loads that store the username in the book.