Control over external switch and stop the Movement

[Bowski]

Dear Community,

i have a 6HC and set up a cnc machine. Now i have external switches to control several functions directly with a hot key. So for example to pause or to move.
With the G0/G1 codes i can move a axes about a specific value ... is it possible to stop this movement with another button?

So for example:
I send
G91
G1 X"max. possible movement"
G90

to move the x axes to the endstop or machine maximum. But what i can send to stop the movement?

Another question, with G10 L20 P1 i can set a Workarea, but how can I go to this 0,0,0 position again without moving each axes manually?

Thanks
Philipp