Interupt Handler

Hi,
Someone can help me?
i've a question about the use of interrupt on linux cnc...
I'm trying the PMDX board, i've a profile to follow, and sometime if the board see a input the system must stop and go to change the tool..
How can i do that..?
How work manual tool change... can an input activate the request for manual tool change, go in a special position to change the tool anch then restart the
process from the last position...

Thanks BigJhonT,

But i need to move until i've seen one sensor and then change the tool...
so i need to freeze the movement change the tool and restart in the last position..
i think M6 doesn't make it

Hi BigJhonT,

I'm glueing a profile on X,Y axis....
I'm using Z axis to dose the glue... but when i've finished the glue in the tank i must stop the movement, remember the position where are the machine, go in change tank position, change the tank and restar going in the last glueing position.
I've provide a sensor to detect when the tank is finihed but i don't know how to perform this process....