Iframe technology allows you to add some external content to your virtual tour. It can be an external html page (or site) with a great design or a YouTube video, booking form or something else. This feature allows you to go beyond the limitations of the krpano engine.
In this tour by Barney Meyer iframe allows the use of a Google street view tour (click on the button with the triangle):
To improve your tour with iframe or to ask further questions, please write us at firstname.lastname@example.org, and we will be glad to help you!