Have you ever opened an InDesign Document and then realized you needed to change the measurement units? You have to go out to the Preferences Panel and make the change, not a huge task, but you can do it quicker.
Once the document is open, bring up the Info Palette. You will see a small triangle next to the crosshair graphic in the upper left of the palette. Click on this triangle and select the units you want to use.
That’s it. Simple.