MarshallSoft DUN Dialer for Visual Basic - Version 2.1 MarshallSoft DUN Dialer for Visual Basic.Ver 2.1. (MDD4VB21.ZIP) 06/13/2002. Use 32-bitWindows Dialup Networking (DUN) to dial up anyinstalled Internet Service Provider (ISP).Requires a 32-bit Visual Basic compiler. See http://www.marshallsoft.com/mdd4vb.htm. Registration is $55 (for email delivery) or $40 for currently registered users of any MarshallSoft winsock product.