In the change event of your first checkbox put this line.xfa.form.PAGE2.otherCheckbox.execEvent('change');This will trigger the change event of your other checkbox. You can use this to trigger any event of any control you have on any page as well.
Setting/Retrieving the button name works, thanks! I'm still not sure on how to retrieve data however. With data I mean the fields that are available under the Data View palette. (bottom left corner, next to Hierarchy for me)