Once you have given VMS the eden command, there will be a short
wait, and you will then see a Prolog start-up message followed by a new
prompt - not a dollar, but the symbols ?-. This tells you that
you are now talking to Prolog. Actually, you are talking to a version of
Prolog into which the code to run Eden has been automatically loaded. In
the rest of these notes, I may use either the name Prolog or the name
Eden, without being too careful about which.
The main thing you do, having started Eden, is to tell it to run a particular bug ``brain'' in a particular world. Let's demonstrate this with a simple production-system bug. Type the command
eps( psbug2, psworld2 ).and go on to the next section. Make sure that you include all the punctuation, including the final dot. You must also hit RETURN afterwards. If you forget the dot or the RETURN, then the system will not regard your input as complete, and will just sit there waiting.