This is not about HTML at all. Apparently, as this is a Web site, you have to follow HTTP protocol. You need to send HTTP request in exact same way you browser does, most likely using "POST" request method
. This is not a problem, because you can always see what a Web page does (what is it, an HTML form or Ajax? must be either one or another).
One of the classes you can possibly use is
, according to this answer: http://stackoverflow.com/questions/8563975/how-to-http-post-to-a-web-form-using-c-mfc
See also: http://msdn.microsoft.com/en-us/library/cttkhz64%28v=vs.80%29.aspx
Hope it was available and worked in VC 6.0, too :-).
Alternatively, you can use the wrapper provided in this CodeProject article: A Fully Featured Windows HTTP Wrapper in C++