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.
Spider silk is a fiber of protein, produced by a gland in the spider's abdomen. The gland stores silk protein in liquid form, which isn't particularly useful for building structures like webs. When the spider needs silk, the liquefied protein passes through a canal where it gets an acid bath.