US Patent 8001454 Differential dynamic content delivery with presentation control instructions

Differential dynamic content delivery embodiments include providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; receiving a prerecorded presentation control instruction; selecting from the session structured document a classified structural element in dependence upon the prerecorded presentation control instruction and in dependence upon user classifications of a user participant in the presentation; and presenting the selected structural element to the user. In typical embodiments, the prerecorded presentation control instruction has an associated time stamp.