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# 6.3 Using an external editor

If you're going to be doing any more than a little programming in `nip2` you probably won't want to use the built-in editor. I suggest you start your favorite editor in one window on the screen and then in the `nip2` program window click `File` / `Open Toolkit` and check the Pin-up box in the file selector.

Now every time you want to try out yout definition, save the file from your external editor and click OK in `nip2`'s file selector.

`nip2`'s editor automatically adds some semi colon characters to separate definitions in a file. If you're using an external editor, you'll need to put these in yourself. Also check the syntax for adding separators and column items to menus.