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Most servers are configured so the services are initiated and started when the system boots. This happens in the boot scripts. These boot scripts excute in a logical sequence insuring that the operating environment is setup properly. For example, check local filesystems and the mount them; start networking services; mount networked filesystems; start database services; start network services.
For example, many people on the net use apache with PHP and MySQL. Because they they run applications with Apache/PHP that use MySQL as the database backend (like this site) you would start MySQL before Apache. All of this occurs in the boot resource directory (/etc/rc.d/ on my systems, every major flavor of UNIX has a different way to do this) but the idea is the same.
Sorry, I would like to add more, but have to run to a meeting.
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