1. A method for differential dynamic content delivery, the method comprising: providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; identifying a recording period within a presentation session; recording, during the recording period, a first presentation control instruction; selecting from the session structured document a first classified structural element in dependence upon the recorded first presentation control instruction and in dependence upon user classifications of a first user participant in the presentation; presenting the first classified structural element to the first user on a first display device; selecting from the session structured document a second classified structural element in dependence upon a second presentation control instruction and in dependence upon user classifications of a second user participant in the presentation; and presenting the second classified structural element to the second user on a second display device.