Re: Prettify keywords

[Gregory Heytings]

> Have looked at prettify-symbols-mode and it is defined in prog-mode.el. 
> This gets me quite confused

I understand, but it shouldn't confuse you.  It happens to be defined in 
the file prog-mode.el, but it is nonetheless independent from prog-mode.

> as I thought that I can only activate a single major mode at a time on a 
> particular buffer.

That's correct indeed.