Presenting to a viewer additional information corresponding to a television program by recognizing key text data included in closed captioning is disclosed. A client computer that is capable of displaying television programming to a viewer and retrieving information from the Internet or from another network receives broadcast data including a program and closed captioning data. The client computer accesses a list of key text data having entries, each of which includes key text that is included in the closed captioning data of a particular program and that is distinctive to the program. The entries in the list of key text data further include instructions enabling the client computer to retrieve the additional information corresponding to the programs. The client computer decodes the closed captioning data and compares it to the key text data entries. When a match is identified, the client computer system executes the instructions included in the entry that has been matched. The instructions typically result in a viewer-selectable link being displayed on the display device. When the viewer selects the link, the client computer retrieves the additional information from a remote server computer and displays the additional information to the viewer.
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