To enable the smart card resource manager to access your device, a symbolic link is created in the registry under:
HKLM\System\CurrentControlSet\VxD\Scmlib\Devices
Each entry has the form:
SCReaderN=Driver.vxd
When you call SmartcardCreateLink (VxD), this entry is generated automatically. SmartcardDeleteLink (VxD) removes the entry.
The name that your driver supplies to SmartcardCreateLink must be either the full name of the driver, including the VXD extension, or the name that has been used in a call to VxD_CreateDevice (VxD).