WinStationBroadcastSystemMessage

function WinStationBroadcastSystemMessage(

  hServer: HANDLE;

  SendToAllWinstations: BOOL;

  SessionId: DWORD;

  TimeOut: DWORD;

  dwFlags: DWORD;

  lpdwRecipients: DWORD;

  uiMessage: ULONG;

  wParam: WPARAM;

  lParam: LPARAM;

  pResponse: LongInt

):LongInt;