The PIN Pad User Exit provides a mechanism for third parties to add support for new PIN Pad and Signature Capture devices to SAP POS. A PIN Pad User Exit implementation is a Windows DLL that is developed as a separate component and is dynamically loaded by SAP POS at runtime. SAP POS supports only one active instance of a PIN Pad User Exit implementation at a time. For more information about how to develop a PIN Pad User Exit implementation, see the SAP POS 2.3 PIN Pad User Exit Technical Reference.