Onefinity sample code - why M7?

I’m looking through the sample code that comes loaded on the BB controller and I’m wondering why M7 is in there?

Hey Chris,

usually this is for turning on workpiece coolant. It activates ‘Load-1’ output (pin 2) on 25-pin I/O port. But it may be used for other purposes, depending on what you connect to ‘Load-1’ output.

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Thanks. Yeah, I know it’s a coolant command, that’s why I was curious. And I realize that it’s just a voltage at a pin so one could put whatever they want there, but I was wondering why it was in this example code for the test piece? Is it intended to turn a vacuum on maybe?