Dash Multipage App: Handling Callbacks

Hi I have a Dash Multipage App containing multiple individual Apps.

How does Dash handle a situation when one single element is used as input for multiple other elements across individual Apps. Are only the elements updated that are currently displayed? Or are all elements updated, even those not displayed?

How should I structure my App?

  1. Make sure an input element only updates other elements within the same individual App.
  2. Use one input element that updates elements in the complete App, even those in other individual Apps.

Thank you for your help.