The Multi-Document Interface (MDI) Script API is an object-oriented DHTML Window toolkit.
It includes a common approach to skinnable UIs in DHTML, off-screen buffering of content using XML,
a few example widgets such as a rich buffered select control, and a scalable design that allows new components to be inserted into the architecture.
At present, browser support is limited to Internet Explorer 5.5 and above, Netscape 6.2, and Mozilla 0.9.3. Bugs in Mozilla in more recent versions, up through 0.9.8, cause browser crashes.
Development of the MDI API is halted. Refer to the Engine for Web Applications project for related work.