http://smsug.ca/blogs/garth_jones/archive/2008/02/22/location-of-last-logon-user.aspxThis query will list most of the place where user name can be determined. Also sometimes I have seen people confuse RegisteredUser0 as the last logon user, this is not the case. This is the Registration name of used for Windows OS. SELECT v_GS_COMPUTER_SYSTEMenCommunityServer 2007.1 (Build: 20917.1142)