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

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DMXGetScreenCount(3)							     DMXGetScreenCount(3)

       DMXGetScreenCount - determine number of back-end screens

       #include <X11/extensions/dmxext.h>

       Bool DMXGetScreenCount(Display *dpy,
			      int *screen_count);

       DMXGetScreenCount() returns the number of back-end screens that a Xdmx(1) server controls.
       Since a DMX screen usually fills all of the available area on a back-end server, there  is
       usually	a one-to-one correspondence between DMX screens and backend servers.  However, it
       is also possible for a DMX screen to cover only part of the available area on  a  back-end
       server, and for more than one DMX screens to occupy different parts of the visible area on
       the same back-end server.

       A DMX screen may be managed as a regular X screen in the Xdmx(1) server or may  be  joined
       with other DMX screens using Xinerama.

       DMXGetScreenCount() sets screen_count and returns True unless there is a protocol error.

       If Xinerama is active, only one logical screen will be available to clients of the Xdmx(1)
       server.	However, this call will accurately  reflect  the  number  of  composite  back-end
       screens that the Xdmx(1) server is using.

       DMXGetScreenAttributes(3), DMXChangeScreensAttributes(3), DMX(3), Xdmx(1)

X Version 11				   libdmx 1.1.3 		     DMXGetScreenCount(3)
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