11. A system for differential dynamic content delivery, the system comprising: means for providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; means for identifying a recording period within a presentation session; means for recording, during the recording period, a first presentation control instruction; means for 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; a first display device configured to present the first classified structural element to the first user; means for 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 a second display device configured to present the second classified structural element to the second user.
11. A system for differential dynamic content delivery, the system comprising: means for providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; means for identifying a recording period within a presentation session; means for recording, during the recording period, a first presentation control instruction; means for 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; a first display device configured to present the first classified structural element to the first user; means for 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 a second display device configured to present the second classified structural element to the second user. 12. The system of claim 11 wherein means for identifying a recording period within a presentation session further comprises means for logging off by the first user during the presentation session.