MarshallSoft Dialup Networking (DUN) Component for Visual Basic. Version 2.1, 6/13/2002. Invoke 32-bit Windows Dialup Networking (DUN) from your application code to dial up any installed Internet Service Provider (ISP). Requires 32-bit Visual Basic compiler (VB4 to VB.Net). For more information, see www.marshallsoft.com/mdd4vb.htm.