bluetooth services and profiles

I am relatively new to Bluetooth and bluez stack.  Sorry if these
questions sound dumb. :)

I saw a lot of web pages about setting up a linux box talking with a
Bluetooth phone.  Typically you would discover a lot of services offered
by the phone.

I am wondering what happens if you hook linux box with a second linux
box.  In other words what kind of services will you find on the Linux
box?  What has to be done to support those similar services on bluez? 

Are they related to the Bluetooth profiles?  I have not seen much about
Bluetooth profile support in bluez.  Do they exist?

The reason I am asking this is because there are now phones powered by
Linux.  I think they support Bluetooth but I don't know if they are
using bluez.  I like to get an understanding on how to provide those
Bluetooth phone services on Linux with bluez.

Thanks in advance.

Jun



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