Is there anyway to obtain the NT Username of for the current session irrespective of wether the have user has connected using trusted security of SQL security.

At the moment, I can only see the Current_User, system_user and session_user which returns the database login name. I need to know that real NT username that established the connection.

If not possible through SQL, can it be done using xp_cmdshell say?

Thanks in advance

Mace