// Notify all windows that environment variables may have changed.

#include <windows.h>

int main()
{
  DWORD dwReturnValue;

  if (SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,
      (LPARAM) "Environment", SMTO_ABORTIFHUNG, 5000, &dwReturnValue))
    return 0;
  else
    return 1;
}