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CentOS 7.0 - man page for glutcreatesubwindow (centos section 3)

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     glutCreateSubWindow -- Create a subwindow

     OpenGLUT - window

     #include <openglut.h>

     glutCreateSubWindow(int parentID, int x, int y, int w, int h);

      parentID	  Parent window identifier

      x 	  Horizontal position of subwindow

      y 	  Vertical position of subwindow

      w 	  Width of subwindow

      h 	  Height of subwindow

     In almost every regard that is important to you, a subwindow is like a top-level window.  It
     has a window id; it has its own set of event callbacks; you can render to it; you are noti-
     fied of its creation; ...

     A subwindow lives inside of some other window (possibly a top-level window, possibly another
     subwindow).  Because of this, it generally only interacts with other windows of your own
     creation, hence it is not subjected to a window manager.  This is the primary source for its
     differences from a top-level window:

      - There are no borders or decorations.
      - There is no title bar, hence no title.
      - Requests tend to be acted on a little more directly, without interference from a window
      - The subwindow inherits the display mode of its parent.

     Like a top-level window, you  must   register a display callback function if you wish to use

     A notable case where this function can fail is for offscreen windows.  A coherent concept of
     a subwindow of an offscreen window would introduce more complication than is presently
     believed to be worthwhile.  Attempting such a window presently just fails.  Failure is
     denoted by a 0  window id	 being returned.

     Subwindows can be very useful for partitioning a window into GUI elements: They have their
     own input callbacks, so you don't have to figure out which window an event is for.  Graphics
     are clipped to the boundaries of your subwindows, so you do not need to worry much about
     where your drawing goes.  Because windows and subwindows work almost identically from the
     perspective of a GLUT program, it is relatively easy to move a cluster of related controls
     into a separate top-level window---or, conversely, embed what was a top-level window inside
     of another window.  OpenGLUT can also report some basic statistics about your (sub)window,
     relieving you of the duty of tracking all of that information for yourself.

     glutCreateWindow(3) glutDestroyWindow(3) glutCreateMenuWindow(3)

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