Abstract: Differential dynamic content delivery including providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; selecting from the session structured document a classified structural element in dependence upon user classifications of a user participant in the presentation; presenting the selected structural element to the user; identifying a device controlling action; and executing the device controlling action to control a device for the user. In many embodiments, identifying a device controlling action includes identifying a device controlling action in dependence upon a presentation control instruction. In some embodiments, identifying a device controlling action further includes identifying a device controlling action in dependence upon a spoken key word. In some embodiments, identifying a device controlling action further includes identifying a device controlling action in dependence upon a classified structural element.