Elevator button abbrs., Bad days on Wall St.

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Possible Answers: DNS.

Random information on the term “DNS”:

The Dynamic Host Configuration Protocol (DHCP) is a standardized networking protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services. With DHCP computers request IP addresses and networking parameters automatically from a DHCP server, reducing the need for a network administrator or a user from having to configure these settings manually.
Taken from Wikipedia