🚀 go-pugleaf

In my case, I pay for a public unix account. So I have dialup into
the service, then internet all over the place. I guess I tend
to forget that not everyone has access to internet.

I would think that there is only one universal solution for formatted text and
graphical presentations: postscript. For those that don't have
postscript output (viewers or printers), then a text version could be
stripped out of the postscript.

But postscript is not enough; you will eventually want hypertext and
animation.  Candidates could include hypercard, QuickTime, or some 
other multimedia/hypercard format. The obvious problem is that
these formats are not supported on all systems.