exec() handles running things on the command line. I didn't want it in the main reference since it's a fairly technical thing, but folks are using launch() and getting confused when it doesn't behave correctly. I couldn't figure out why this was being reported somewhat frequently, forgetting that I probably said "let's not put exec() in the main reference."

Should we add a reference page for exec(), or maybe we should add a link to the javadoc from the launch() reference? Where's the javadoc live these days?