http://gobby.0x539.de/ is about changing the same text file at the same
time. It's kind of fun, really. A bit like kids building a snowman,
with many pairs of hands working at the same time. Please look at the
ascii drawing (the second screenshot in the main page).
I wonder if we could have that kind of cooperative editting on an
outline. When I tried editting a flat textfile I didn't think of trying
it with tabs; if they can't be used then at least we could have leading
*s or spaces, and change them to tabs at savefile time.
No folding or hoisting or jumping to other outlines, and it appears to
depend on a graphical interface, but other than that this gobby thing is
really cool, GPL and multiplatform.