runlevels question

["Provost, Stephane" <sprovost@nuera.com>]

Hi,

>From reading Heather's latest response:

> entires out of your /etc/inittab.  And you can set up one of the runlevels
> to have a lot less running than your normal "plugged into the LAN" mode
> where you have more going on.  Read the man page on update-rc.d to tune
> that to your taste; I usually use either runlevel 4, or runlevels 7
> through 9 (after creating them) for that.

I have a question. How do you set up multiple runlevels, such as one if the
laptop is plugged into AC, one if it is on battery, one if connected to the
LAN, one if it's a leap year, etc... I didn't know that was possible, and
I'd be interested to know how to do it.

Pointers to resources on the WWW is fine too.

Thanks a lot !

--Stephane