glutPopWindow,  glutPushWindow - change the stacking order
of the current window relative to its siblings.

glutPopWindow
	glutPopWindow() -> None
glutPushWindow
	glutPushWindow() -> None

void glutPopWindow(void);
void glutPushWindow(void);

glutPopWindow and glutPushWindow work  on  both  top-level
windows  and subwindows. The effect of pushing and popping
windows does not take place immediately. Instead the  push
or  pop  is  saved  for  execution upon return to the GLUT
event loop. Subsequent push or pop requests  on  a  window
replace  the previously saved request for that window. The
effect of pushing and popping top-level windows is subject
to the window system's policy for restacking windows.

glutShowWindow, glutIconifyWindow, glutHideWindow

Mark J. Kilgard (mjk@nvidia.com)