The waiting time shown is the longest a customer currently in this office has waited after taking a number. It is accurate as of the time given. The automatic numbering system in this driver licensing office continuously tracks the amount of time it takes to serve each customer after they take a number.
A Web crawler may also be called a Web spider, an ant, an automatic indexer, or (in the FOAF software context) a Web scutter. Web search engines and some other sites use Web crawling or spidering software to update their web content or indexes of others sites' web content.
Spiders take a Web page's content and create key search words that enable online users to find pages they're looking for. When most people talk about Internet search engines, they really mean World Wide Web search engines.