HP Vectra XM5 4 Technical Reference Manual page 44

soon as the PC is plugged in. RPO hardware can produce a triggering signal which turns on the
PC.
The following diagram gives a simplified view of the useful states that the PC can be in: the
three On states ( Fully-On , Standby and Suspend ), the RPO state (when the CPU is Off , and
the RPO hardware is powered by VStandby), the Off state (when everything is powered off),
and the state that is caused by power failure or unplugging the PC.
The following diagram gives a more accurate, more detailed account of the valid state
changes. It highlights two limitations of the RPO system: power-off before the operating system
boot procedure has initialized the RPO function, or a power failure whilst the system in RPO
mode, will each de-activate the RPO function.