What is "Netlogon" in my Windows XP service list? And how is "Netlogon" service related to netlogon.dll?

"Netlogon" is a Windows XP service that "Maintains a secure channel between this computer and the domain controller for authenticating users and services. If this service is stopped, the computer may not authenticate users and services and the domain controller cannot register DNS records. If this service is disabled, any services that explicitly depend on it will fail to start." "Netlogon" service is provided by netlogon.dll DLL file.

Detailed information on "Netlogon" service:

Service name: Netlogon
Display name: Netlogon
Execution command: C:\Windows\system32\lsass.exe
Start type: Automatic
Service status: Started
Dependencies:
   Workstation

"Netlogon" service is provided by a DLL file called: netlogon.dll:

Name: netlogon.dll
Location: C:\Windows\System32\netlogon.dll
Description: Net Logon Service DLL
File version: 6.1.7601.17514
Size: 550 KB (563,712 bytes)
Modified: Saturday, November 20, 2010, 7:20:28 AM

Disabling "Netlogon" service may cause issues when running Windows XP system.

⇒"lsass.exe" Services on Windows XP

⇒⇒Windows XP Services Tutorials