17. The system of claim 16 , wherein the properties of the active task include at least one of application software being employed to perform the active task, the type or genre of the active task, attributes related to the user manipulating the active task, properties of an information source on which a search will be conducted, and the state of the active task.
16. The system of claim 13 , wherein: the instructions, when executed by the data processor, further control the data processing system to determine properties of the active task; and the assigned weight is tunable based on the properties of the active task.