The StarTap Button

A button with a twist

(use your Back button to go back to the preceding screen)
Assigning a program to a button is no big deal, but this one's a little different. Press it once, and it brings up StarTap (duh!). BUT, press it again, and it will switch you back and forth between two tasks. Task A - Press - Press - Task B, then two more presses and your back to Task A. Want to refer to your Calendar while you update your ToDo list in Tasks? No Problem!