Folks, Thanks to all the help I've gotten on this list, the first somewhat-useful version of my xpeek package is now available at <https://github.com/jcsalomon/xpeek>. See the Downloads tab there for the .tds.zip and the PDF documentation. Thanks especially to Bruno: As I noticed yesterday, he's actually the one who wrote most of the code! (Bruno: do you want your name as one of the authors?) This version can actually do useful work, though I'm still not sure about the interface. But when Robin or Reiner come back from their much-needed vacations, I'll be submitting this to CTAN. Comments about coding & documentation style (and formatting) are welcome (off-list, most likely); bug reports to the GitHub bug tracker. This package is also an early adopter of l3doc & l3docstrip—am I the first outside the LaTeX3 group to use l3doc?—so expect bug reports and style questions from me on those topics. —Joel