"Turn your vision into reality by creating your own version of an existing PDF or textbook. Give it a dynamic touch, jot down notes, add video/audio clips, and discuss materials with your readers within your interactive content. Use Active Textbook to learn, teach or simply share your documents online - it's easy!"
"Upload PDF files to the Active Textbook server and overlay click-to-view resources - called these hotspots - to incorporate teaching content from various sources."