HT202856 Can keyboard brightness controls be mapped for a 4K monitor on the Thunderbolt port?

I have a 4K monitor (ASUS PQ321Q) attached to my late-2013 MacPro.
The monitor-button controls for adjusting brightness are awkward, to put it kindly.
Keyboard brightness controls don't seem to work.  Is it possible to map them to control the external 4K monitor's brightness?

Yes.  Here's a quote from the attached article:
If your Mac has one or more Thunderbolt ports, you can connect up to two displays to those ports.
http://support.apple.com/kb/PH3793

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