27. The computer program product of claim 23 further comprising: computer instructions, recorded on the storage device, for receiving a presentation control instruction, wherein the presentation control instruction includes a presentation action identifier and optional parameters; wherein the second classified structural element is selected in dependence upon the presentation action identifier and the parameters.
27. The computer program product of claim 23 further comprising: computer instructions, recorded on the storage device, for receiving a presentation control instruction, wherein the presentation control instruction includes a presentation action identifier and optional parameters; wherein the second classified structural element is selected in dependence upon the presentation action identifier and the parameters. 28. The computer program product of claim 27 further comprising: computer instructions, recorded on the storage device, for creating the presentation control instruction by receiving from the first user participating in the presentation a key phrase and optional parameters for invoking a presentation action and parsing the key phrase and parameters against a voice response grammar into a presentation control instruction.