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LM117HVQML: Output and Output/Sense

Part Number: LM117HVQML

Hello all,

The TI datasheet page 2 http://www.ti.com/lit/ds/symlink/lm117hvqml.pdf , Figure 3  shows the LM117HVGW-QML  16-Pin CFP pin connections.

It also has a statement that says "For the CFP device to function properly, the “Output ” and“Output/Sense ” pins must be connected on the users printed circuit board."

The schematic diagram on page 3 only shows 3 pins connected.  

What is the 4th pin (Output/Sense) and why do the outputs have to be connected on the users printed circuit board for the CFP device to function properly?