From ReactOS

typedef struct _USERCONNECT
{                           // xp   7
  ULONG ulVersion;          // 000  000
#if WIN32K_VERSION < NTDDI_WIN7
  ULONG ulCurrentVersion;   // 004  
#endif
  DWORD dwDispatchCount;    // 008  004
  SHAREDINFO siClient;      // 00c  008
} USERCONNECT, *PUSERCONNECT;

References

• userexts.dll