[segatang]

Hi,
As my knowledge, the Windows XP supports

* Conventional turn-off *
"The OS should close all data/processes" then the PC turns off all power of its peripherals.
When you press the power button of the PC again, it means you "restart(reboot)" the data/processes of OS from HDD to RAM from "zero condition".

It is like that a man lost his memory.
He should get his blank memory back from his dairy, etc (HDD) to his memory part of brain (RAM).

So, turn-off/restart(reboot) always cost a lot time about mins, you known.

* Hibernate mode *
"All recent data/processes in the RAM is written into HDD" for a while; then the power is entirely shut down like conventionally turning-off mode (note: no power consumed anymore after hibernate.)

It is like that a man sleeps all night. [/i]
His brain and his body full into deep sleep all night (no power consumed), but he can remember everything soon (about 30 seconds), when he wakes up (resume).

It just needs the time for all recent (actually, it became "previous", now) data/processes is written back from HDD to RAM. The OS is rebuild by the resent data/processes, not from the zero condition.

* Standby(suspend) mode:
Very low power is consumed to retain "all recent data in the RAM", but power of other peripherals such as monitor, HDD, fan, etc is stopped.

It is like that a man is just dozing/taking a nap.
Therefore, you can resume PC (wake up him) to do the previous work very quickly in about several seconds after other peripherals powered up.

Because the RAM continuously keeps the recent data/processes, theoretically the stanby/suspend mode will beresumed very very very fast, but time delay still exists due to delay of the peripherals.
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I believe the PPC or Palm's standby/suspend mode is as the same as above because PPC or Palm stiil consumes power after into the mode.
No reason why the same X-scale CPU based iLiad cannot make it.