Each time that you launch Mach4 in demo mode (without a license), it will
run for a limited time with all functions available. When the demo time limit
is reached, Mach4 will just stop providing motion output. The idea is to
allow potential customers to fully evaluate the system, but prevent
unscrupulous vendors from supplying a demo copy of Mach4 masquerading
as a licensed system when they try to sell you hardware.