Button creation has been a feature of InDesign for some time but it used to be done via the clumsy Button tool. Thankfully this was replaced in CS4 with the Button panel which makes button creation and configuration simple and straightforward. Remember that Acrobat also has button functions which are different to those in InDesign. Both applications have unique and complimentary functions so it’s worth considering them both in your interactive workflow.
Any InDesign frame (including a table) can become a button. In this case, I’m converting two shapes into navigation buttons for use in a PDF. Select the desired frame and bring up the Buttons panel (once again I’m using the Interactive For PDF workspace).