Im a little confused at how wait is meant to work, so for a file like this: # OG 30usecs spawn spawn1 50usecs spawn spawn2 60usecs sleep 20usecs 65usecs wait 70usecs exit # spawn1 10usecs sleep 10usecs 20usecs spawn spawn2 25usecs wait 30usecs exit # spawn2 10usecs sleep 30usecs 40usecs exit # What is it actually waiting for? This is a valid file according to the sample solution. And am I correct in saying that if wait is called with nothing to actually wait for then it just goes back to the READY queue?