Ok, let me see if I can explain this in a good way. Oradim is an Oracle utility that creates a Service to a db. If a db is created upon install, or if you use Database Assistant to create a db, it will automatically use this utility to create a service to the db upon creation of the db. If you double click on the Services icon in Control Panel, you will see all the services that are available to the machine. If a machine has a db running on it, you will see a service by the name of OracleService(SID) with a manual or automatic startup type. If the startup is set to automatic, the db will shutdown/startup whenever the machine is restarted, else you will have to shutdown/startup manually.
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Example of Oradim to create a service for an 8i db:(to be typed at command prompt) --->
ORADIM -NEW -SID (DB_NAME) -INTPWD ORACLE -STARTMODE AUTO -PFILE (PATH_OF_PFILE) ---> This creates a service to a db with an automatic startup.