No I think you are on the same page as me.
I only used the term as thats what the chap called it when he set up a job in a milling machine.
I think it is the same as making sure the job is flat or as needed when starting a job or getting the lathe part right in the jaws.
It's this process that I am looking for a how to and tips on and also what dials etc or gauges you need or what is recomended.
As I said this is a whole new thing to me and just want to learn whats what