The 2nd part of the series will take a brief look at IGS' command structure. If you made a spectrum of protocols based on their commands' "terseness", I imagine NAPLPS would be among the most compact on the left side, RIPscrip might be in the middle, and IGS would be at the right among the least compact.

Code for some of its commands is fairly readable, but others (particularly the `&` Loop command) can be nearly inscrutable.