Go and check mailing list .. Few months ago someone asked same question.
http://blog.gmane.org/gmane.linux.bluez.devel/month=20070501


well i don't know about DBUS but with obex and hci layer I have controlled multiple  Dongles.
You can find solution here



On 7/18/07, Fernando Unzu <fernando@bluexare.org > wrote:
Hello,

I have a question about how to select which device I want to use with my
program.

I have an application that sends some content t another bluetooth devices, and
i realize the transfer with Obex functions.

But if I have two dongles in my PC, I would can to select between one and
other.
This is what i don't know how to do.

The handle is created with Obex_Init, and I think it is in that moment when I
select one of the dongles, but I don't know how.

Or there is another way to do it?? Or it has to be done in another moment with
another function??

I have eard that DBus solves this problems...; anybody can help me, please?

P.D.: Although anybody gives me a DBus solution, I'm interesting in the Obex
solution too.

Thank you,
Fernando Unzu

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