Hardware Considerations for Biometric Drivers
A biometric device that uses the WBDI framework should meet the following requirements:
WBDI-based drivers should follow DEVFUND-0010 guidelines for Terminal Services redirection.
This requirement states that the device and its driver must support redirection through a Terminal Services session over the PnP Device Redirection Framework.
Biometric devices should have an internal buffer that is large enough to cache a full scan in full power and suspend modes.
Larger buffer size can mean less dependency on timing during regular scan processing as well as scan processing during system resume.
The device should be able to enter a capture mode and make internal state transitions during a scan without extra commands from the host.