Since Eclipse 3.1, search in the workbench has been partitioned into two major categories: development artifact search and information search. The former is handled by the search dialog opened from the Search menu. The later is available from Help>Search menu item which opens the new Help view into the Search page.
The new information search facility uses multiple search engines run in parallel using the same search expression. Eclipse provides a number of preconfigured search engines. New engines can be added programmatically or by the user. All the results are collated in the Search page directly.