9. A system for differential dynamic content delivery for a presentation, the system comprising: at least one processor configured to; identify a preexisting presentation document for the presentation, the presentation document including a presentation grammar and a structured document having a plurality of structural elements, including a first structural element classified with a first classification identifier and a second structural element classified with a second classification identifier; identify user participants for the presentation, the user participants each having a user profile comprising a user classification, the user participants including at least one user in a first user classification and at least one user in a second user classification; filter the presentation document based upon the user classifications of the user participants and the classification identifiers to generate session data targeted for the participants of the presentation, wherein the filtering comprises: presenting first session data targeted to the at least one user in the first user classification, the first session data comprising the first structural element, but not the second structural element; and presenting second session data targeted to the at least one user in the second user classification, the second session data comprising both the first and second structural elements; stream speech to a user participant of the user participants; detect a total sound level for the user participant, wherein the total sound level comprises the streaming speech plus ambient noise; and display a textual transcription of the speech to the user participant if a ratio of the total sound level to the ambient noise level is less than a predetermined value.
9. A system for differential dynamic content delivery for a presentation, the system comprising: at least one processor configured to; identify a preexisting presentation document for the presentation, the presentation document including a presentation grammar and a structured document having a plurality of structural elements, including a first structural element classified with a first classification identifier and a second structural element classified with a second classification identifier; identify user participants for the presentation, the user participants each having a user profile comprising a user classification, the user participants including at least one user in a first user classification and at least one user in a second user classification; filter the presentation document based upon the user classifications of the user participants and the classification identifiers to generate session data targeted for the participants of the presentation, wherein the filtering comprises: presenting first session data targeted to the at least one user in the first user classification, the first session data comprising the first structural element, but not the second structural element; and presenting second session data targeted to the at least one user in the second user classification, the second session data comprising both the first and second structural elements; stream speech to a user participant of the user participants; detect a total sound level for the user participant, wherein the total sound level comprises the streaming speech plus ambient noise; and display a textual transcription of the speech to the user participant if a ratio of the total sound level to the ambient noise level is less than a predetermined value. 10. The system of claim 9 , wherein the at least one processor is configured to present a structural element from the session data responsive to speech input by a user participant.