Server locator points are used in a Configuration Manager 2007 hierarchy to complete client site assignment on the intranet and help clients find management points when they cannot find that information through Active Directory Domain Services.
Intranet clients use Active Directory Domain Services as their preferred method to complete site assignment and find management points. However, clients must use a server locator point if the Active Directory schema is not extended for Configuration Manager 2007 or the site is not published to Active Directory Domain Services, or if clients do not belong to the same Active Directory forest as the site server’s forest.
Note: You need only one server locator point for the Configuration Manager 2007 hierarchy, even if you have multiple sites. In a multi-site hierarchy, install the server locator point in the central site. If you install a server locator point in the middle of the hierarchy, it will have no knowledge of sites above it in the hierarchy.
To install the Server Locator Point Role >> Link
How you can patch your machines using the SUP in SCCM. More specifically we will be utilising Update Lists >> Link