Tell me what else you know that I don't know.
Reply to note from Harry Binswanger <hb@xxxxxxxxxxxx> Thu, 20 Oct 2016
> I just discovered an undocumented (I think) feature: <IP+n> and
> <IP-n>. This is a great feature for building outlines, or code-
OMG, Harry. This was documented in Signature: Making the Transition
(XyQuest 1991), at p. 4-4 . As one of innumerable examples, run
IFEI2<Helpkey> against XPL code with nested IFs/EIs, then toggle into