Automatically create forms with WP 3 Network mode, modifying wp-config.php

Do you have any more detailed explanation of how to automatically create forms with WP network mode? I saw in the new version overview the info below but I'm not a coder and still had some questions.
What is typically replaced in the "full/path/to/"? Is that gf_import.xml file automatically created or should it already exist? If it's created, where should it go within the WP folders (that might answer my first question about the path...). I know these are probably basic questions but I tried a few ways of modifying the wp-config.php and ended up getting errors. Thanks.

=========== from the new version release notes
When a new site is created, Gravity Forms can automatically import forms into that new site using the standard Gravity Forms XML export file. You can pre-define the export file to import in your wp-config.php file by adding define(“GF_IMPORT_FILE”, “full/path/to/gf_import.xml”);
Along with the ability to create forms automatically in WordPress 3.0 Network mode, themes can now include a form export file and tell Gravity Forms to create a form(s) when the theme is activated. You can pre-define the export file to import in your themes function.php file by adding define(“GF_THEME_IMPORT_FILE”, “gf_import.xml”);
============

Thanks Carl. That really helps!

One more thought... I am using a child theme and the code below is returning the name of the parent theme. It may think that the form is already loaded. Could this be the problem?

$themes = get_option("gf_imported_theme_file");

No, it's not working. The code I am referring to is line 438 in gravityforms.php:
$themes = get_option("gf_imported_theme_file");

It is returning the name of the parent theme. I don't know if that is the source of the problem or not. Here is what I am doing.
Create a new blog in my multisite setup
the default theme is twenty twelve
I activate the child theme with this in the child theme functions.php define('GF_THEME_IMPORT_FILE', 'gform.xml');

This should kick off when the child theme is activated, right?

This will be a nice time saver for my multisite implementation and I am looking forward to making it work. What is the next step in figuring this out?

I initially pointed it to an Amazon S3 public url and that didn't work so I tried the relative path as mentioned higher up in this thread which also didn't work. My implementation for this feature is on a multisite environment where the domain is different every time. Can I use a WP function like get_stylesheet_directory() to form the path instead?

So instead of this:
define("GF_THEME_IMPORT_FILE", "http://www.domain.com/path/to/gf_import.xml");

It would look like this:
define('GF_THEME_IMPORT_FILE', get_stylesheet_directory() . '/gf_import.xml');