Selecting this tool will create a Wikipedia tab in the context window space.
You can write the search word(s) in the search field or just place the cursor in the word in the edit window. You may also mark more words. If you select "autosearch", the program will look for the word chosen without a search click. As soon as the word/phrase appears in the search field, you can go on working, while the Wikipedia entry (if any) is fetched. The currently selected language will be used, but you can change that manually.