DMXQueryExtension - determine if DMX is available
#include <X11/extensions/dmxext.h>
Bool DMXQueryExtension(Display *dpy,
int *event_basep,
int *error_basep);
DMXQueryExtension() determines if the DMX protocol extension is
available. It will be available if the server is an Xdmx(1) server.
If the DMX protocol extension is available, event_basep and
error_basep will be set to the event and error bases, respectively, and
True will be returned. Otherwise, False will be returned.
DMXQueryVersion(3), DMX(3), Xdmx(1)