1. A system for differential dynamic content delivery, the system comprising: means for creating a session document from a presentation document, including: means for 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; means for identifying a user participant for the presentation, the user having a user profile comprising user classifications; and means for filtering the structured document in dependence upon the user classifications and the classification identifiers, including, means for extracting, from the structured document, structural elements having classification identifiers corresponding to the user classifications, and means for writing the extracted structural elements into a session structured document in the session document; means for providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document; means for selecting from the session structured document a classified structural element in dependence upon user classifications of a user participant in the presentation; means for presenting the selected structural element to the user, including: means for selecting a data communications protocol for the presentation; means for inserting the selected structural element in a data structure appropriate to the data communications protocol; and means for transmitting the data structure to the user according to the data communications protocol; means for identifying a device controlling action in dependence upon a presentation control instruction, a spoken key word, a classified structural element, and a classification identifier; and means for executing the device controlling action to control a device for the user, further comprises means for calling a member system in an OSGi-compliant bundle operating in an OSGi framework on a services gateway.