Remeber that I don't use the v_R_system views to determine the last logon user and here is why.

http://smsug.ca/blogs/garth_jones/archive/2007/03/22/224.aspx

http://smsug.ca/blogs/garth_jones/archive/2007/03/23/225.aspx

SELECT  GS.Name0,
 GS.UserName0,
 WS.LastHWScan,
 GS.Domain0,
 OS.Caption0,
 SYS.SystemRole0
FROM
 v_GS_COMPUTER_SYSTEM GS,
 v_GS_OPERATING_SYSTEM OS,
 v_GS_SYSTEM SYS,
 v_GS_WORKSTATION_STATUS WS
WHERE
 GS.ResourceID = SYS.ResourceID
 AND WS.ResourceID = GS.ResourceID
 AND OS.ResourceID = GS.ResourceID
 AND SYS.SystemRole0<>'Server'
 AND Datediff(dd,WS.LastHWScan,getdate()) > -1
 AND (GS.Domain0 = 'gartek.tst'
 OR GS.Domain0 = 'Doghouse')