Go ahead, fire the modal.
Modals should only be used if you need to stop the user in whatever they're doing. Otherwise, use a popup. Modals can also be used if you need to venture off to retrieve some data for a portion of your page and you need more real estate than a popup provides.
This uses the jQuery UI plugin straight out of the box. See the jQuery UI site for documentation.
There is no currently exposed API via the IxF.
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