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DMXGetInputCount - determine number of input
devices 
#include <X11/extensions/dmxext.h> 
Bool DMXGetInputCount(Display *dpy,
                      int *input_count);
DMXGetInputCount() returns the number of input devices connected
to the Xdmx(1)
 server in input_count. This number is the same as that returned
by XListInputDevices(3X)
, but is available even when the XInput extension
is not supported. 
DMXGetInputCount() returns True unless there
is a protocol error. 
DMXGetInputAttributes(3X)
,  XListInputDevices(3X)
,
 DMX(3X)
, Xdmx(1)
 
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