The possibilities for using DHTML in your Visual C++ .NET applications are endless: You can create completely dynamic applications, applications that update from the Internet, client/server ActiveX controls, and so on. If you'd like to learn more about DHTML, here are some good resources:
Inside Dynamic HTML by Scott Isaacs (Microsoft Press, 1997)
Dynamic HTML in Action by William J. Pardi and Eric M. Schurman (Microsoft Press, 1998)
The Platform SDK (an excellent resource on DHTML and other Microsoft technologies)
msdn.microsoft.com (which discusses DHTML in several areas)