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Thanks! That looks like precisely what I need. I'll have a chance to play with this more in a day or two, I'll let you know if it worked.

Assuming I've properly created a new environment, let's call it "fmeo" (for my eyes only), how would I create a command that would suppress this environment from showing up when running pdflatex?

The idea is that I'd like to be able to create the pdf file without the contents of fmeo if the command ...