Jim,
Hitting the emergency stop kills everything. I had my power for my router wired in to my control box so that if i had to hit the "kill switch" it stops the movement and the router.
However..if you see impending disaster about to happen and want to stop it without losing everything you can (at least on my version of software and prt alpha) just hit the SPACEBAR and that will pause the action. Depending on how you have it wired or using a spindle it may not kill that but you won't lose your coordinates and have to start over.
Words of Wisdom:
“Words that sink into your ears are whispered…… not yelled”
“The biggest trouble maker you’ll probably ever have to deal with, watches you from the mirror every morn’n”
“The only difference between a rut and a grave is the depth”
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Just remember...when it's time for the hearse to pull up..there's no luggage rack on top!
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The beauty of the Second Amendment is that it will not be needed until they try to take it...Thomas Jefferson