How are you starting Proxo under Windows XP?

[pooms]

In the past I've run proxo on a W2K laptop with a single user. I just bought a
new computer that is running XP Pro and will be shared by me and my girlfriend.
I notice that XP has this concept of "switching" users which W2K doesn't have.
What is the best way to run Proxo under XP so that multiple users can use it, and
only one copy of Proxo is running? I used to just put Proxo into my startup directory so it runs when I log in, but if I do this for both user accounts, i think
this could result in multiple copies of Proxo running at the same time. I suppose
it should be run as a service, but is that possible?