Apart from Google two other companies are offering customized search engines. These are Microsoft and Optevi. Microsoft in March had launched a live search feature 'Search Macros'. Search Macros helps in building an advanced search query. These search queries are then stored in search bar for later use. Advanced query strings helps you to keep out particular sites, search for certain page characteristics as well as you can also prioritize some sites. Users can create their own Macros. On Optevi, visitors have option of either creating or choosing from 'bundle' of sites which in turn affect the search results. The inclusion and ranking of sites are affected by selection made by the users. To learn more about Optevi search you can have 'The Optevi tour'.