Otherwise known as an &quot;abstract&quot;. Arguably this document has one, but it&#x27;s a few lines down behind what would in the printed original be on the inside front cover.<p><i>&quot;Here is some little known data which may be of interest to computer hackers. The items and examples are so sketchy that to decipher them may require more sincerity and curiosity than a non-hacker can muster. Doubtless, little of this is new, but nowadays it&#x27;s hard to tell. So we must be content to give you an insight, or save you some cycles, and to welcome further contributions of items, new or used.&quot;</i>