29. A system, comprising: a graphical user interface module to receive a comment; a processor to operate the graphical user interface module; a storage element to store opaque state information in an electronic document data file including dynamic content and organized according to a page descriptive format, the dynamic content comprising a media content that changes state over time, the media content comprising scripted content, the page descriptive format being a device-independent and display resolution-independent fixed-layout document format, the opaque state information including frame information associated with the media content and referencing a state selected from a plurality of states associated with the media content, the selected state comprises user-customized content elements, the selected state being associated with the comment added to the media content, the comment being directed to the selected state, wherein the selected state of the media content to which the comment is directed can be rendered from the electronic document data file using the opaque state information; and a rendering module to receive the opaque state information from the storage element and, based on the opaque state information, render the selected state to which the comment is directed.
29. A system, comprising: a graphical user interface module to receive a comment; a processor to operate the graphical user interface module; a storage element to store opaque state information in an electronic document data file including dynamic content and organized according to a page descriptive format, the dynamic content comprising a media content that changes state over time, the media content comprising scripted content, the page descriptive format being a device-independent and display resolution-independent fixed-layout document format, the opaque state information including frame information associated with the media content and referencing a state selected from a plurality of states associated with the media content, the selected state comprises user-customized content elements, the selected state being associated with the comment added to the media content, the comment being directed to the selected state, wherein the selected state of the media content to which the comment is directed can be rendered from the electronic document data file using the opaque state information; and a rendering module to receive the opaque state information from the storage element and, based on the opaque state information, render the selected state to which the comment is directed. 31. The system of claim 29 , further comprising: a receiving module to receive the opaque state information from a rendering program associated with a type of the dynamic content.