When viewing a Minimode version of a Process the browsers back button fails to cycle through the previous pages.

Either Open Process links in a new tab to be able to return to the original Process easily

Or Enable the bread crumb in the Admin > Configure > Minimode settings.  This will allow you to navigate through the Process structure.

When using Minimode links and clicking on Process links to other Processes, the URL for the Minimode doesn't change, the new Process opens within the same window.  This means that the browsers back button doesn't hold any history to go back.