Likewise Open Status Update
User-mode I/O Framework and associated user-mode drivers-SMB redirector-SMB server-Named pipe before sending the IRP to the correct driver •A Win32 compatibility layer can be provided to insulate Server Service (cont) 29 NPFSPVFSRDRSRV Lwiod LwMsg CreateNamedPipe ntcreate&X(\srvsvc) … Access Doc

Technical Deep Dive Into The Likewise SMB Server
At run time by the I/O Mgr core  rdr.sys.so -SMB client file system  npfs.sys.so -Named pipe before sending the IRP to the correct driver  A Win32 compatibility layer can be provided to insulate Server Service (cont) 33 NPFSPVFSRDRSRV Lwiod LwMsg CreateNamedPipe ntcreate&X(\srvsvc) … Read Full Source