QuickTime 3 Reference
QuickTime 3 allows uniform resource locators (URLs) to be asociated with sprites in a sprite track. Your application may use sprites as buttons in a QuickTime movie, for example, which trigger URL links. The QuickTime Sprite Export Xtra for Macromedia Director will be updated to support this feature.
The new QT atom for a sprite URL is described in "Key Frame Samples and Override Samples" . A new function for retrieving a sprite URL, SpriteMediaGetURLLink , is described in this chapter.