[Mac OS X TeX] what is/was "Instant TeX" ?

[Troy Goodson]

<x-flowed>Every once in a while I hear about "Instant TeX" that, I think, 
is/was available for NeXT.  Can someone describe "Instant TeX"?  Was 
it something like LyX <http://www.LyX.org/> or TeXmacs 
<http://www.TeXmacs.org/> ?

And, what's the big stumbling block to getting apps like these on Mac OS X?

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