1. A method for differential dynamic content delivery, the method comprising: creating a presentation document, including: creating, in dependence upon an original document, a structured document comprising one or more structural elements; classifying a structural element of the structured document according to a presentation attribute including identifying a presentation attribute for the structural element, identifying a classification identifier in dependence upon the presentation attribute, and inserting the classification identifier in association with the structural element in the structured document; and creating a presentation grammar for the structured document, wherein the presentation grammar for the structured document includes grammar elements each of which includes an identifier for at least one structural element of the structured document, wherein creating a presentation grammar for the structured document includes identifying the content type of the original document, selecting, in dependence upon the content type, a full presentation grammar from among a multiplicity of full presentation grammars, and filtering the full presentation grammar into a presentation grammar for the structured document in dependence upon the structural elements of the structured document; creating a session document from a presentation document, including: identifying a presentation document for a presentation, the presentation document including a presentation grammar and a structured document having structural elements classified with classification identifiers; identifying a user participant for the presentation, the user having a user profile comprising user classifications; and filtering the structured document in dependence upon the user classifications and the classification identifiers; filtering the presentation grammar, in dependence upon the extracted structural elements, into a session grammar in the session document; providing to a multiplicity of users a presentation including content from a session document including: providing a session document for the 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 including selecting a classified structural element having an associated classification identifier that corresponds to the user classification; and presenting the selected structural element to the user; streaming presentation speech to the user including individual speech from at least one user participating in the presentation; converting the presentation speech to text; detecting whether the presentation speech contains simultaneous individual speech from two or more users; and wherein detecting whether the presentation speech contains simultaneous speech from two or more users further comprises determining whether a period of individual speech from a first user overlaps a period of individual speech from another user wherein the presentation speech contains simultaneous individual speech from two or more users, and the method includes identifying a period of simultaneous speech, and displaying the text if the presentation speech contains simultaneous individual speech from two or more users including: displaying presentation text for a presentation period longer than the period of simultaneous speech; segregating display text according to channel; and segregating display text according to user.