Windows Networking Logon Client Installation inserts Systems Management Server (SMS) commands into the logon scripts of site resources that run a Windows network operating system (Windows 95, Windows NT Server, or Windows NT Workstation).
These commands make any resource that logs on to the specified logon points an SMS client, if this installation method is enabled for the site. However, the resource is installed as an SMS client only if site assignment is successful (meaning the resource is in an IP subnet or has an IPX network number that matches those included in the site it is trying to join).
In a domain where Windows Networking Logon Client Installation is enabled, all domain controllers become SMS logon servers.
Configure Windows Networking Logon Client Installation
Client Installation Configuration Overview