Event Details
Operating System->Microsoft Windows->Built-in logs->Windows 2000-2003->Security Log->System->EventID 515 - A trusted logon process has registered with the Local Security Authority
EventID 515 - A trusted logon process has registered with the Local Security Authority
This event record indicates that a logon process has registered with the Local Security Authority (LSA). Also, logon requests will now be accepted from this source.

Note: 
Logon processes are trusted components responsible for collecting identification and authentication information from external devices, such as terminals and networks where users are trying to log on by different logon methods such as incoming RAS connections, RunAs, interactive logons initiated by CtrlAltDel, and network logons (as in drive mappings). These components use Local Security Authority services to log these users on. A single system can simultaneously support multiple logon processes.

Find more information about this event on ultimatewindowssecurity.com.

Corresponding events on other OS versions:

Windows 2008
 Sample: 
        Event Type:		Success Audit
        Event Source:	Security
        Event Category:	System Event
        Event ID:		515
        Date:		4/17/2009
        Time:		9:04:15 AM
        User:		NT AUTHORITY\SYSTEM
        Computer:		KERMIT
        Description:
        A trusted logon process has registered with the Local Security Authority. This logon process will be trusted to submit logon requests.

        Logon Process Name:	CHAP

        For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows 2000
Windows XP
Windows 2003
Category System
Source Security
EventId 515
Field Matching
FieldDescriptionStored inSample Value
DateTime Date/Time of event origination in GMT format. DateTime 10.10.2000 19:00:00
Source Name of an Application or System Service originating the event. Source Security
Type Warning, Information, Error, Success, Failure, etc. Type Success
User Domain\Account name of user/service/computer initiating event. User RESEARCH\Alebovsky
Computer Name of server workstation where event was logged. Computer DC1
EventID Numerical ID of event. Unique within one Event Source. EventId 576
Description The entire unparsed event message. Description Special privileges assigned to new logon.
Log Name The name of the event log (e.g. Application, Security, System, etc.) LogName Security
Category A name for a subclass of events within the same Event Source. Category Logon/Logoff
Logon Process Name The name of the registered logon process InsertionString1 CHAP
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