To make BGInfo display UPN / Logged On Username
(This will display what the user uses as logon name)
Open your *.bgi file
Create a custom field by clicking "Custom.."
In the User Defined Fields dialouge click "New.."
In the Define New Field dialouge enter the following:
Identifier: Logged on Username
Replace Identifier with: Mark "Registry value" and "64-bit registry view"
Add your newly created field by marking "Logged on Username" and then click "< - Add"