This menu item will restart the server program. This is almost never necessary. A master zone will respond to a change in its zone file when the new zone file is saved, and all slave zones currently connected through QuickDNS Manager will update as well. Slave servers not currently connected will update after a period defined by the Refresh value in the SOA record for the zone. However, if you manually change zone information on a server, or manually add or remove zones, you should consider restarting.