), receive categorized suggestions which are based on the context of the user-selected text (or in some cases the wisdom of crowds), and view the results in floating information boxes which can be sized, shared, docked, closed and stacked on top of the document that has the user’s primary focus.
Some simply provide a list of links in a context menu to other websites, such as the proposed Internet Explorer 8 Accelerators feature.
A key challenge for selection-based search is that a long or nested list of categories quickly becomes unwieldy for the user.
When the user selects the name of a company, the system needs to identify the concordant stock symbol and an appropriate financial database such as Yahoo!
On the other hand, the process is sometimes said to be redundant if the system applies no intelligence to categorizing the selected text and matching it to an online service, and simply provides a link for the user to their preferred search engine(s).