glutRemoveOverlay  -  removes  the overlay (if one exists)
from the current window.

glutRemoveOverlay
	glutRemoveOverlay(func) -> None

void glutRemoveOverlay(void);

glutRemoveOverlay removes the overlay (if one exists).  It
is  safe  to  call glutRemoveOverlay even if no overlay is
currently  established--it  does  nothing  in  this  case.
Implicitly,  the window's layer in use changes to the nor-
mal plane immediately once the overlay is removed.

If the program intends to re-establish the overlay  later,
it  is typically faster and less resource intensive to use
glutHideOverlay and glutShowOverlay to simply  change  the
display status of the overlay.

glutEstablishOverlay, glutDestroyWindow

Mark J. Kilgard (mjk@nvidia.com)