15. A system, comprising: one or more data processing apparatus; and one or more computer-readable storage devices including instructions executable by the data processing apparatus and upon such execution cause the data processing apparatus to perform operations comprising: receiving a sequence of symbols that have been optically captured from a rendered document; determining that the sequence of symbols includes a particular symbol, word, or phrase that has been mapped to one or more actions; selecting an action from the one or more actions; and transmitting an instruction to a document management system to perform the selected action.
15. A system, comprising: one or more data processing apparatus; and one or more computer-readable storage devices including instructions executable by the data processing apparatus and upon such execution cause the data processing apparatus to perform operations comprising: receiving a sequence of symbols that have been optically captured from a rendered document; determining that the sequence of symbols includes a particular symbol, word, or phrase that has been mapped to one or more actions; selecting an action from the one or more actions; and transmitting an instruction to a document management system to perform the selected action. 16. The system of claim 15 , wherein the operations further comprise: receiving information that identifies a user of a capture device used to optically capture the sequence of symbols from the rendered document; wherein selecting the action from the one or more actions is based at least in part on a profile of the user.