Microcosm (and here's an ad) is a puzzle book by Hal Gashtan. Unfortunately, that's pretty much all I can tell you, since I have made very little progress. There's a forum at Quest4Treasure with a bit more information.
Microcosm (25k; Win32 & DOS binaries, C source). This is a C conversion of the Basic program, with all the text built-in.
Windows GUI version (13k; includes C source) -- uses drop-down lists to select lines and key.
A message! Start ucosm with this file; or close microcosm, replace state.txt with this file and restart.
10 February, 2009.