Configuring Simple Learning Tools Interoperability
The Resource URL is only used by some External Tools. This is a URL that is readible across the web. An example URL might be to a publically downloadable IMS Content Package - which you are providing to the external tool.
All external tools support launch within an iFrame. Some tools optionally support a widget launch. A widget launch means that the tool produces HTML markup which will be embedded directly in the page instead of in an iFrame. If you check the Prefer Widget Launch option, the external tool will be informed that your first preference is to use the in-lined widget approach.
The value you enter for Preferred Width / Height will be passed into the External Tool. If the tool an be resized - it may adjust itself to be this size.
The value if iFrame Height sets the height of the iFrame if the launch ends up being an iFrame launch.