The YubiKey is a primarily a onetime password generator device and has very little memory, only enough for its base functionality. A YubiKey cannot be used as a general password storage device. Whenever, the YubiKey button is pressed, it generates a one time password which is valid only once.
The YubiKey is a write only device i.e. information can only be written to YubiKey and can not be read from it. Hence it is not possible to determine automatically (by reading the information stored in the YubiKey) if the YubiKey belongs to a particular user or not. Users need to provide YubiKey OTP at the time of authentication so that the username to YubiKey mapping can be verified.
AuthLite software provides YubiKey based two factor authentication for Windows Logon based on YubiKey OTP and user's Windows domain credentials. AuthLite also provides centralized management of the YubiKeys. However, we are not sure if it provides YubiKey based authentication for remote terminal access. Please contact AuthLite support for more information about their product.