Retrieve User ID

Is there a way to find a user's identity WITHOUT resorting to a macro to retrieve 'application.username'. In other words, can I grab application.username from a cell function alone. I have a lot of spreadsheets used by a lot of people at my company, and I want to tag their printouts with their names, but I'd rather not hit them with the macro authorization popup, if I don't otherwise need VBA for the spreadsheet to work.