1. A method comprising: at a first time, prior to a presentation on a presentation device: receiving, on the presentation device, a grammar which assigns semantic representations to natural language input; and updating the grammar based on a searchable plurality of presentation source files stored on a storage device connected to the presentation device via a network, to yield an updated grammar, wherein the searchable plurality of presentation source files comprise one of audio clips and video clips, wherein the searchable plurality of presentation source files is processed by extracting content from each searchable presentation source file to generate (1) a web-based form of each searchable presentation source file; (2) a listing of key phrases; and (3) a corpus of all sentences that appear in all the searchable presentation source files; and at a second time after the first time, during the presentation, and on the presentation device: receiving, from a user, a spoken natural language content request for a presentation source file from the searchable plurality of presentation source files; identifying possible presentation source files in the searchable plurality of presentation source files, wherein the possible presentation source files are identified by using the updated grammar to process the spoken natural language content request; receiving, from the user, input identifying the presentation source file from the possible presentation source files, wherein the input is in a modality distinct from speech; and adding the presentation source file to a deck for use in the presentation.
1. A method comprising: at a first time, prior to a presentation on a presentation device: receiving, on the presentation device, a grammar which assigns semantic representations to natural language input; and updating the grammar based on a searchable plurality of presentation source files stored on a storage device connected to the presentation device via a network, to yield an updated grammar, wherein the searchable plurality of presentation source files comprise one of audio clips and video clips, wherein the searchable plurality of presentation source files is processed by extracting content from each searchable presentation source file to generate (1) a web-based form of each searchable presentation source file; (2) a listing of key phrases; and (3) a corpus of all sentences that appear in all the searchable presentation source files; and at a second time after the first time, during the presentation, and on the presentation device: receiving, from a user, a spoken natural language content request for a presentation source file from the searchable plurality of presentation source files; identifying possible presentation source files in the searchable plurality of presentation source files, wherein the possible presentation source files are identified by using the updated grammar to process the spoken natural language content request; receiving, from the user, input identifying the presentation source file from the possible presentation source files, wherein the input is in a modality distinct from speech; and adding the presentation source file to a deck for use in the presentation. 3. The method of claim 1 , wherein the presentation source files are viewgraphs.