centos man page for glutgetwindow

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NAME
     glutGetWindow -- Return the current window identifier, 0 if undefined

LIBRARY
     OpenGLUT - window

SYNOPSIS
     #include <openglut.h>

     int
     glutGetWindow(void);

DESCRIPTION
     glutGetWindow() returns the  window id   of the  current window  .  This is useful, e.g., if you have a generic function that is used with
     several windows and it needs to temporarily change to another window.  (There is no window stack for you to use with pushes and pops.  Do not
     be confused by glutPushWindow() and glutPopWindow(); those pushes and pops are  not   stack-related!)

     One cause for the function to return 0 is if you have called glutDestroyWindow() on the  current window   and have done nothing to set a new
     window as current.

SEE ALSO
     glutSetWindow(3)

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