Is it possible to type on your keyboard and have it write in two different applications at the same time? I would like to write in Vim and another application which gives me intellisense (smart autocompletion). I'm not sure how this would work. But it would be extremely nice to have.
Indirectly, you might get close to what you want by writing to a file and have both vim and your other application setup to autoreload on changes to the file.
vim Can be configured to autoreload but it depends on your other application if it offers that functionality.