NetworkQueryConnection queries what remote network resource a local device name is connected to.

#include <nwiapi.h>

PSZ       ConnectName;
ULONG     ulLevel;
PVOID     pBuf;
ULONG     cbBuf;
PULONG    pcbNeeded;
ULONG     ulreturns;

ulreturns = NetworkQueryConnection(ConnectName,
              ulLevel, pBuf, cbBuf, pcbNeeded);