If you have a basic custom search engine, you can set it to search the entire web. Note that results may not match the results you'd get by searching on Google Web Search. If you do set your search engine to search the entire web, you won't be able to use on-demand indexing.
Convert a search engine to search the entire web:
- On the Custom Search home page, click the search engine you want.
- Click Setup, and then click the Basics tab.
- Select Search the entire web but emphasize included sites.
- In the Sites to search section, delete the site you entered during the initial setup process.