To Log Off, Power Down or go Stand-by with WinXP Pro?

[eecon]

Do AV updates, Diskeeper opertations and other scheduled tasks (like the monitor shutting off per Lenovo Power Manager settings) still function on WinXP Pro systems when the user is logged off (but still connected to shore power with the HDD still spinning)?

I've noticed faster and snappier performance when not going to standby or powering down every night on my T61p ..... I simply switch it to a low adaptive power mode with Lenovo's latest Power Manager over night (it's always in a docking station and never travels).

Thanks.