Good: average apps continue to work as expected. Bad: good apps can't know what's supported or not. What's missing from the article is adding a way for apps t

Good: average apps continue to work as expected. Bad: good apps can't know what's supported or not. What's missing from the article is adding a way for apps to detect and handle this behavior. (Using the printer example) There should also be some API that tells me "printing is not supported on this platform" somehow. If I want to be a good software developer I should hide the print button in the UI in a very predictable way. It's great that if I actually try to print nothing happens as expected. It's bad if I can't detect that printing would never work, and I should be able to do that via at least some function call that doesn't magically noop.