Window *FindWindowById(WindowClass cls, WindowNumber number);

void DeleteWindow(Window *w);

void DeletePlayerWindows(PlayerID pi);

void ChangeWindowOwner(PlayerID old_player, PlayerID new_player);

void ResizeWindow(Window *w, int x, int y);

void InitWindowSystem();

void UnInitWindowSystem();

void ResetWindowSystem();

void InputLoop();

void InvalidateThisWindowData(Window *w);

void InvalidateWindowData(WindowClass cls, WindowNumber number);

void RelocateAllWindows(int neww, int newh);

void DeleteNonVitalWindows();