Can I use Windows API calls in ASP? If so, do I have to declare functions?
Unfortunately, at this time you cannot call API functions from ASP. The only functions you can call are those that are exposed as methods by a COM object.
set myobj = Server.CreateObject("classname")
However, if you wish to use the API, you can write your own Visual Basic or C++ COM object and have the ASP page call the COM object that in turn calls the API. Remember, you can only access the API on the Web server, not on the client browser.