Microsoft Knowledge Base Article 815263 contains the following summary:
This article lists programs that
interoperate correctly with the NTFS file system and with the File Replication Service (FRS).
The FRS is a multi-threaded, multi-master replication engine that replaces the LANMan Directory Replication service (LMRepl service) on domain controllers that run Microsoft Windows NT version 3.x or 4.0. Windows 2000-based domain controllers and servers use the FRS to replicate system policy and logon scripts for Microsoft network clients. The FRS can also replicate content between Windows 2000-based and Windows Server 2003-based servers that host the same fault-tolerant Distributed File System (DFS) root or child targets.