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 we know chiefly as spinners of webs, sometimes with much apparent beauty, the purpose of which is to ensnare other insects which they may devour. By long threads of webs, also, spiders sail in the air sometimes considerable distances.