I think in these metaphors it's important to draw a line somewhere between "to use" and "to program". That line isn't always clear -- the usual example being an

I think in these metaphors it's important to draw a line somewhere between "to use" and "to program". That line isn't always clear -- the usual example being an Excel spreadsheet. Using an application is like programming in its language of pushbuttons and input fields. Programming is like using a compiler.