Event Error Logs with Event ID 538 and 540

From: Orvs (Orvs_at_discussions.microsoft.com)
Date: 04/29/05


Date: Fri, 29 Apr 2005 09:18:09 -0700

I saw some logs in my Boss XP machine with SP2.
Some notable logs in Security were Event ID 538 and 540

Category : Logon/Logoff
User: NT AUTHORITY\ANONYMOUS LOGON
Source:Security
Type: Success/Audit

what is the best explanation for this? He is thinking that there is an
anonymous logging remotely to his machine?

Thank you