hi
i hate to impose on your generosity and patience, but i am desperate to learn and understand.
i saw the video showing how to use a reference tool, ie calibrate it. but i am not certain as to the reason for it.
when i used my cnc in the linux world, i would indicate a tool for a given tool path. when i ran the gcode, it would ask me to insert that given tool. i would then i let it run (i never did anything more fancy than vcarving or nameplates). so perhaps that is the reason that referencing to a tool or offsetting never was an issue.
it would certainly be nice if the folks at newfangled offered assistance by providing literature with information explaining the theories and concepts of cnc use with their software (reminds me of the first kawasaki motorcycle i purchased back in the early 80's--the salesman said "here's the keys, this is the clutch, this is the throttle, this is the brakes, and this is the gears. goodbye, good luck, enjoy!). it was a LONG ride home.... :-)
jacques