Query about drivers

Hi,

I have questions about drivers. If there are three COM ports. As per Device driver model in symbian, There is 1 to 1 mapping between logical device and physical device. Now LDD and PDD will be same i.e. ecom.ldd and ecomm.pdd. Now three different users want to use three different ports(let suppose user1 wants to use COM port 1 and user2 wants to COM port2 and user3 wants to use COM port3)? So User1 will try User::LoadLogicalDevice(ecomm.ldd)
and User::LoadPhysicalDevice(ecomm.pdd).Similarily user2 and user3 will use these APIS. Will it create three COM port objects corresponding to three users?
So how symbian device driver address this? Then will there be three logical devices corresponding to three physical devices means three driver instances (three logical channels corresponding to three physical channels)?

Thanks