Lichuan LC20E Homing, End switches, Probing

 
 
So i am retrofitting my Bridgeport 412 with ethercat 1kw 17bit incremental servo's (LC20E) from lichuan. I have been able to achieve a fully moving machine.I am at the stage where i want to home all axis.  To achieve this i want to use the homing feature in the driver. So i am going to try rodw's homecomp to do this. I was wondering if i press the e-stop during homing does it stop the homing operation on the driver? Asking for safety reasons  

Also my BP412 has a shared limit switch. I was wondering should i do this through the driver or linuxcnc? The issue i see with the driver is that it doesn't have a function for a shared limit switch. I guess i am kind of answering my own question but i am wondering how everone else is thinking about it.

Also the manual talkes about a probe function. I was wondering if someone could tell me about what the purpose of this is or for what it can used for?

Kind regards,
Andries