Seneca 5, one of our local Alliance Partners in Seattle, has introduced an operator interface. Leave it to a LabVIEW guy like me to get excited about a few real buttons!

This gives your operators a real button to press, and it gives you LabVIEW code that's easy to integrate into your program. See more about the interface at:
https://www.ni.com/en/support/downloads/tools-network/download.select5-api.html