RE: activity monitor How do I decide which process to delete?

The directions state to choose the process that uses the highest percentage of CPU to help determine which process to delete.  How can I know what is necessary and what is not?
The article on runaway applications and battery power did not help me at all.
Thank you!

What directions?
Don't kill any process unless you know what the effect will be when you do or you don't care if it happens to crash or hang when you do (because in that case you would know why).
What exactly is the goal here or the reason to be trying this?
Maybe you need more ram.  Check your Activity Monitor and read the folowing to help you determine that:
Using Activity Monitor to read System Memory and determine how much RAM is being used
Maybe you are having disk errors and need boot from your installer dvd to run Disk Utility to repair/verify your drive (not repair permissions).

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