1. A method for differential dynamic content delivery, the method comprising: providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document, the session document further including a first classified structural element and a second classified structural element received from a presenter; providing a session copy of a first user profile including a first user classification associated with a first classified structural element; providing a session copy of a second user profile including a second user classification associated with the first classified structural element; receiving, from the presenter, a user classification instruction to change the second user classification in the session copy of the second user profile; changing the second user classification to an altered user classification in the session copy of the second user profile to associate the second user classification with a second classified structural element in dependence upon the presenter's instruction, wherein the first user classification remains associated with the first classified structural element; presenting the second classified structural element to the second user in response to the second user classification becoming associated with the second classified structural element; and presenting the first classified structural element to the first user in response to the first user classification remaining associated with the first classified structural element.