Why do we need to have a observer run on the different computer

Hello team,
Why do we need to have a observer run on the different computer and how to install & confgure it on that different computer.?pls help
5.5.6 Managing the Observer
The observer is integrated in the DGMGRL client-side component and runs on a different computer from the primary or standby databases and from the computer where you manage the broker configuration. The observer continuously monitors the fast-start failover environment to ensure the primary database is available (described in Section 5.5.2.1). The observer's main purpose is to enhance high availability and lights out computing by reducing the human intervention required by the manual failover process that can add minutes or hours to downtime.
Thanks

854393 wrote:
Thanks Aman,
Do we need a same db binary & OS version for starting the observer on the different computer ?? here the primary & standby are liunx.
Thanks in advance..
Regards,it does not have to be on the same platform or operating system on which the databases reside, and it does not need Oracle EE and an instance (which means no extra license).
To configure check this.
http://gjilevski.wordpress.com/2010/03/06/configuring-10g-data-guard-broker-and-observer-for-failover-and-switchover/

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