Think Outside Sierra Keyboard - Manual (Page 11)

4. If several Stowaway Sierra keyboards happen
to be nearby and in Discoverable Mode, the
scan will display all of these devices in the list.
The keyboard ID (Bluetooth address) printed
on the back of the keyboard should be
compared with the IDs in the list and the
desired keyboard selected.
5. If the application finds more than one
Bluetooth stack on the mobile device, it will
display a Stack Selection dialog box. If the
device has a built-in Bluetooth system, that
stack should be used. If the device is using a
removable Bluetooth card such as a SDIO
card, a different stack may need to be used. If
the wrong stack is selected, a connection may
not be possible. In such case, rerun the
connection procedure and select the correct
stack.
6. If the keyboard driver displays the Bluetooth
system not detected message, first verify
that the driver has been loaded into Main
Memory. Next, be sure that the device has
not been upgraded with an incompatible
version of the Bluetooth stack. In this case the
keyboard software must be replaced with a
compatible version.
Stowaway Sierra Owner’s Manual for Windows Mobile
Page 11