12. The computer system of claim 11 , further comprising: instructions for, in response to a user selection of the second virtual channel, displaying, at least partially, information items associated with the second set of search results and the second set of chunks within the first document to the user.
12. The computer system of claim 11 , further comprising: instructions for, in response to a user selection of the second virtual channel, displaying, at least partially, information items associated with the second set of search results and the second set of chunks within the first document to the user. 13. The computer system of claim 12 , further comprising: instructions for displaying a search box associated with the user-selected first virtual channel; instructions for receiving one or more user-specified search keywords; instructions for identifying chunks satisfying the user-specified search keywords within the first set of chunks; and instructions for displaying the identified chunks and their corresponding information items to the user.