Undocumented functions of NTDLL

NTSYSAPI 
NTSTATUS
NTAPI
NtQuerySymbolicLinkObject(

  IN HANDLE               SymbolicLinkHandle,
  OUT PUNICODE_STRING     pLinkName,
  OUT PULONG              pDataWritten OPTIONAL );

pLinkName
Received path to destination object.
pDataWritten
- ???