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I know that interrupt must come from hardware to interupt software continue execute.
Give other process the right to run.
I just know about general function of APIC.
How to program it is main question?

Check the wiki now,
And you shall discover it,
a link to help.

Haiku aside:

• Read the appropriate wiki page: http://wiki.osdev.org/APIC
• Try writing some code.
• Let us know if and where you get stuck.