JInternalFrame (tag)

From JAXXWiki

The <JInternalFrame> tag creates an instance of javax.swing.JInternalFrame. As with all Swing tags, the package name is assumed only because javax.swing is imported by default. The fully qualified form of this tag is <javax.swing.JInternalFrame>.

This information is based on the Java Development Kit version 5.0. Other versions of Java may have more or fewer features.

Most of this component's features are supported by JAXX's default component support.
As long as you know its API (and the general rules followed by DefaultComponentHandler) you know most of what there is to know about using this tag. The remaining features will be documented soon.