See these man pages: apm(4), apm(8), apmd(8), and acpi(4).
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Hint #1:
Powering down your computer may be done with halt(8) or shutdown(8).
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Hint #2
APM can be used to set the computer to standby or suspend mode, but only if the computer's BIOS supports APM. Modern BIOSes may not support APM.
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Hint #3
ACPI support on OpenBSD does not support standby or suspend.
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