A925- Bluetooth connection problem

Hi, I'm trying to connect my Sony Vajo to the Internet using a Motorola
A925 and bluetooth.
*The Cell can connect to internet through UMTS (carrier Three=tre in italy)
*I can connect the sony vajo and the cell using an usb cable and
navigate using the custom program "three mobile"
*The cell sees the vajo through bluetooth
The three mobile program cannot see the cell through bluetooth, I think
is a program limitation, is there a standard way to connect the vajo
and the cell using BT? Perhaps a generic BT modem driver or things like
that?
My os is WinXP
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> any help is well accepted
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> THANX