XineramaActive(3X11)

     NAME
          XineramaActive - returns the state of the Xinerama extension

     SYNTAX
          #include <X11/extensions/Xinerama.h>

          Bool XineramaActive(
            Display        *dpy,
            int             screen_number
          );

     ARGUMENTS
          dpy  Specifies the connection to the X server.

          screen_number
               Specifies a given Xinerama screen.

     DESCRIPTION
          XineramaActive returns the state of the Xinerama extension
          on the specified display connection dpy, for the Xinerama
          screen screen_number.

          XineramaActive returns True if the given screen is an active
          Xinerama screen, False otherwise. An active Xinerama screen
          is a large logical screen composed of multiple underlying
          physical screens (also called frame buffers).

     DIAGNOSTICS
          BadValue
               screen_number is out of range.

     NOTES
          Currently, all the physical screens managed by the Xinerama
          enabled X server are combined into one active Xinerama
          screen. This means that screen_number should be 0.

          Xinerama is still not an Xorg standard. Thus, the interface
          may still evolve.

     SEE ALSO
          Xinerama(3X11), XineramaGetData(3X11),
          XineramaGetCenterHint(3X11).