Output from callback in one file as input to callback in another file

I have two .py files (one.py, two.py) as part of a Dash app, each corresponding to a page in the app. I have a callback in one.py that has an output that I want to use as an input to a callback in two.py. Additionally, when the callback in one.py fires, I want the app to redirect to the page corresponding to two.py. What is the best way to go about this? Thanks!