MarshallSoft DUN Dialer for Xbase++ - Version 2.1 MarshallSoft Dialup Networking (DUN) Component for Xbase++. Version 2.1, 7/02/2002.Invoke 32-bit Windows Dialup Networking (DUN) from your Xbase++ application code to dial up any installed Internet Service Provider (ISP). Requires Alaska Xbase++ compiler. For more information, see www.marshallsoft.com/mdd4xb.htm.