Bluetooth Question

I have a question relating to bluetooth.
I have been reading up on bluetooth phones and which work best with
the Prius. I have a 2006 Prius, and I use Sprint for a wireless carrier.
From what I read the Treo 650 seems to be one of the most compatable
phones with the Prius that works on the Sprint network. My current
phone doesn't have bluetooth and I have not had occasion to play
with the technology so I have a question. Here is the scenerio I would
like to set up. I would like to know if it is possible to set up a bluetooth
connection in this fashion. If I can find a Treo 650 for a price I am willing
to pay I'd like to set up the Treo in the Prius and link them together.
Then, I would like to get a bluetooth headset and set it up identically
using the same password or passphrase, etc. Basically I would like
to pair the Treo to the Prius, then turn the car off and pair a headset
to the same settings the car is set for so I could use the headset inside
the house within 30 feet of where the car is parked. So my question is:
can I set up 1 connection on the phone and use 2 different devices at
different times if they both are set up for the same settings? Or basically pair
each of them at different times using the same settings, then use
them each at different times without having to set up 2 bluetooth connections
on the phone and switch the phone between the 2 connections?
My thought was that if the connections are identical if they are being
used at different times that it should work, but I was talking to a salesman
at an unidentified electronics store who showed me his bluetooth phone
and showed me he had 2 different bluetooth connections he had set up
and had to switch his phone to whichever he wanted to use before he
got ready to use it.
Anyone know if my plan would work or if it would require 2 different
connections and switching between them?
Thanks in advance for any help.

 

Cool that's exactly how I was hoping it would work.

Thanks for your help