[DllImport("ole32.dll", SetLastError = true)]
public static extern int CoQueryClientBlanket(
out IntPtr pAuthnSvc,
out IntPtr pAuthzSvc,
[MarshalAs(UnmanagedType.LPWStr)] out string pServerPrincName,
out IntPtr pAuthnLevel,
out IntPtr pImpLevel,
out IntPtr pPrivs,
out uint pCapabilities
);