Exactly how does OAM (ICM) monitor the status of services?

Hi all,
I would like to know how OAM (well, ICM really) monitors services.
How does ICM check that a service is up and running? Is some sort of query send to the service that it must respond to? Or does ICM merely do a simple check to see if the service is merely "running" in memory or a "running" process.
The reason I'm asking is because what if the service is "running" as a process but has hung. Checking that it is a currently "running" process will return that yes, it is running. But issuing some kind of interrogation request requiring a response will show that is hanging and thus not running.
Anyone able to shed some kind of light on this for me will be greatly appreciated.
Thanks,
-Greg Cubitt
Oracle South Africa

You can put the ports that connect an important server as managed in fault managements "detailed device view".
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