Google is a powerful Internet search engine that also allows users to search, using keywords, for messages posted in newsgroups and discussion forums on the Internet. When searching for topics in newsgroups, the advanced search facility allows users to select options such as dates or newsgroups. Under a general search using keywords such as 'community-based rehabilitation' users can access all messages posted on that topic, any 'thread' (replies or messages on a similar theme), details of which discussion group the message originated from and links to relevant websites
