gecko 320 and err/res function

Do people generally use the Err/res terminal on the drive as a drive
enable from the computer? I would like make it go high to enable the
axis like some of the other controllers out there, and I would also
like hook it to an input to my computer, to stop the program if there
is a fault. I can do one or the other, but I am not sure if I can do
both. How can this be best done? Has it been done? Can it be done?

Thanks for any help.

Eric