Obj-C and Background/Daemon Application Question

FROM : Tom Jones
DATE : Sat Feb 16 22:07:15 2008

Hello,
I'm looking for more information on how to create a Background/Daemon 
application. I've been learning Obj-C and I really like it. I have 
bought what books I can on the subject but none of them really cover 
this subject.

I have written a few tools for myself but now I want to step it up and 
develop a Background/Daemon tool which should run when the system boot 
til it shuts down.

I have looked at Apple's dev site and at the examples but it feels 
like this is a subject area that they do not cover. So any info sites, 
example code or what every that could help would be great.

Thanks,
tom