Funny NYPD wrote:
> I have gone through some of the open source source code editor, most of
> them limit to two views of the same documents.
> 
> This is a strong limit on MCU C programming. E.g. I am write a main
> function which might call 4~5 different functions, and I am searching
> different variables from time to time, I want all of them being shown
> on different sub-windows at the same time.

If that's the sort of thing you like to do, then emacs is probably your
best bet; any number of windows looking arbitrarily into any number of
buffers.

Use viper if you like the vi command interface (I do).

-- Dave Tweed
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