Among other new features, the POS for .NET v1.12 update provides improved Plug and Play support for service object developers. The previous Plug and Play model only worked with devices that were recognized by the Windows® Plug and Play subsystem. Several device types do not fall in this category, such as some Smart Card, Biometrics, and Bluetooth devices.
In order to provide Plug and Play functionality to these devices, a new means of support was added to POS for .NET 1.12. This support includes exposing two new interfaces to service object developers, IDeviceEnumeration and IDeviceEnumerationPnP.
See thte attached docment for more details.