Differential dynamic content delivery with alternative content presentation

A system for differential dynamic content delivery, the system comprising:

• means for providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document;
• means for receiving a presentation control instruction to present a classified structural element of the session document, wherein the classified structural element comprises one or more versions of presentation content;
• means for determining whether at least one version of presentation content of the classified structural element exists for a user;
• means for identifying alternative display content for the user if no version of presentation content of the classified structural element exists for the user;
• and
• means for presenting the identified alternative display content to the user.

A computer program product for differential dynamic content delivery, the computer program product comprising:

• a recording medium;
• means, recorded on the recording medium, for providing a session document for a presentation, wherein the session document includes a session grammar and a session structured document;
• means, recorded on the recording medium, for receiving a presentation control instruction to present a classified structural element of the session document, wherein the classified structural element comprises one or more versions of presentation content;
• means, recorded on the recording medium, for determining whether at least one version of presentation content of the classified structural element exists for a user;
• means, recorded on the recording medium, for identifying alternative display content for the user if no version of presentation content of the classified structural element exists for the user;
• and
• means, recorded on the recording medium, for presenting the identified alternative display content to the user.