ASP.NET App with Unmanaged Code - HELP!

From: Ted (ted.singh_at_embeddedautomation.com)
Date: 12/10/04 

Date: Fri, 10 Dec 2004 00:00:55 -0800

I think the following is a security configuration issue, can someone help?
I've been stumped on this for a couple of days now and I'm feeling the heat
at work. 

--
I'm using a 3rd party ActiveX control which has it's own constructor and two 
very simple methods (which ultimately sends out messages on the server's USB 
port). I am trying to run this ActiveX component in my ASP.NET applicaiton. 
For now, I'm testing this application via *localhost* connection, but will 
eventually go to a client/server domain.
At first, within the Page_Load method, I successfully instantiate it using 
the constructor -- no exceptions caught:
try
{
    oABC = new ABCClass();
    Response.Write("oABC object was created");
}
catch ..
Later, upon a button press, I try to use the method(s) within oABC -- again, 
it appears everything works - no exceptions caught:
try
{
    Object err;
    err = oABC.Method1( "xxx", "xxx", null, null);
    Response.Write("Method1 Succeeded - err = " + err.ToString());
}
catch ...
*BUT*, Method1 doesn't appear to send out a USB message.
*HOWEVER*, Method1 works fine in console C# app called directly from the 
command line or if I surf to a VBScript/HTML file with the method call, 
which presumably uses the ActiveX on the client's IE container. In both of 
these cases the USB port receives/sends the messages.
Right now, IIS is running Anonymous Authentication (though Windows 
Authentication is also checked in the dialog box), ASP.NET is running 
Windows Authentication. Impersonation is not set (default=false). No 
application identities set. Also, I have no CAS settings assigned. I think 
this means that the calling process would be System process -- shouldn't 
this have all the rights required?
If the unmanaged code is accessing files, I/O, etc. does the calling 
assembly need to provide access?
Any recommendations?
Ted