<i>Having actually used &quot;dumb terminals&quot;, like the DEC VT-100, Qume QVT-101 and others over RS-232 connections and shoe-box sized modems way back in the 80&#x27;s I found the start of your comment to be somewhat funny.</i><p>Back in those terminals&#x27; heyday, they were &quot;smart&quot; terminals! Dumb terminals could handle text output (sometimes to paper), but had few if any control codes and certainly not the extensive VT100 escape-code set for cursor control, formatting such as bold or underline, etc.<p><i>Who knows what Ctrl-K-X belongs to?</i><p>WordStar! And joe.