I want to execute an InputScript when the user presses a pushbutton:

Pushbutton (8,5) "Button" process="delivery_functions.txt"
Using function = "switch_ups"

But it does not work.

Each pushbutton command needs a function code, e.g. "/8" or"=XXX". If you simply need "Enter", please specify "/0" as function code:

Pushbutton (8,5)   "Button"  "/0"   process="delivery_functions.txt"

Using function = "switch_ups"