All, I got sick of poring over my Peer-to-Peer communications version of Lion's commentary - trying to read it while digging around in v6 was getting annoying. Of course, if you don't already own, rush out and by a copy. It's great stuff. Anyhow, the problem is that it's perfect bound, landscape and it's not searchable. Hunting around the internet, I found pdfs that were searchable, but they were based on v7 being back-engineered to v6 code. So, I located a decent source of electronically readable Lion's source at https://warsus.github.io/lions-/ and off I went. I took the code and did a bit (quite a bit) of tweakage on it to get it formatted in pdf, and created a version in letter format that I find pretty useful. It can be read from a printout while messing around in v6. I've done some proofing, but I don't claim it's perfect. If you find any issues with it, let me know and I'll try to fix them (thanks, Clem for early suggestions). Here's what's in the letter sized pdf: Tweaked Cover Page Improved Table of Contents Lion's version of V6 Source Code Appendices     Source File Sheets Alphabetical List     Source File Locations in Running V6 System What isn't in the pdf: Original Forewords, Prefaces, or Letters (not needed for coding) Symbol Lists, Cross references, or Indexes (beyond my skills at the moment) All in all, I have found it quite readable and useful for my own work. I don't claim any ownership or contribution, other than in improving the readability of the work for modern readers. If the cross reference thing kills you, just use gnu ctags on the source directories and ctags -x for the line numbers. Here's the link to the posting: http://decuser.blogspot.com/2022/02/tweaked-version-of-lions-v6-source-code… - will