tracking log ons/log offs

Hi,

I'm looking for something to track users logging on/off on Win XP Home...

So:

when a user logs in, it records the username, machine name, time and date. when they switch user (Win + L) it also logs it, but as 'away' time. and when the user logs it/

It would also be good if it tots up the total time of a day, week, month and from the beginning.

this could be a .exe that ran every 5 minutes or something. It doesn't need to be accurate to the second, but to every 5 minutes or so.

dunno if this is easy to do,

thanks anyway