1. A method in a computing system for navigating an electronic document, the method comprising: receiving user input selecting a portion of the content of a rendered document, the portion constituting a sentence fragment; in response to receiving the user input: identifying (1) an electronic document contained in a corpus of electronic documents, the identified electronic document containing the selected document portion, and (2) a position within the identified electronic document at which the selected document portion occurs; and causing to be made available to a user actions associated with the identified position in the identified electronic document, wherein at least one of the identified actions was associated with the identified position before the receipt of the received user input.