When you go into Printer Properties (e.g. from the Control Panel), there is a button called 'Preferences' on the 'General' tab and another button called 'Printing Defaults' on the 'Advanced' tab.
They both open similar dialogue boxes which give options to set, for example, Paper Size, but the values can be different.
What is the difference between these two options?
Note, this is accessing the printer directly via the Control Panel - nothing is being printed.