What resource is placing the text "guest" in the %%For: field in the postscript header, see example below ?

Issue: Need to control costs and chargebacks based on user account name.
"guest" appears in Command Workstation and Job Log data.

iPhone, iPad & iTouch devices do not have local user names, accounts or login names, accounts.
iPhone, iPad & iTouch devices have device names, but only appear in iTunes when connected to a Mac or Windows host.

Header Example:

%%Title: (Photo)
%%Creator: (PrintMe Connect)
%%CreationDate: (12:09 PM Friday, May 20, 2011)
%%For: (guest)
%%Pages: 1
%%LanguageLevel: 3