From Apple’s developer documentation, I present: The Classic Environment and Your Application. I found this while trying to figure out what the problem I have been experiencing with the clipboard between Classic apps and Mac OS X native apps. The answer? It doesn’t work and that is how things are supposed to work. It’s as if they didn’t understand how important the clipboard is to getting work done. I’m still about twenty apps away from ditching Classic, so I’m stuck with the problem for now.