IDTech Windows SDK Guide  1.2.177.8
API reference for Kiosk III
Initialize Kiosk III/IV:

A Singleton instance has been established in the IDT_KioskIII class. Establish the callback, and then set a connection to Kiosk III/IV through either USB or Serial.

public KioskIII_Simple_Demo()
{
InitializeComponent();
IDT_KioskIII.setCallback(MessageCallBack);
//USB Connection:
IDT_KioskIII.useUSB();
//Serial Connection SRED:
//IDT_KioskIII.useSerialPort(1, true);
}