Window HTTP IO Completion port

Window HTTP IO Completion port

I was going through the IO Completion port documentation of Windows
programming with relation to the Windows HTTP Server API.
So in the HTTP Server API, we have a queue which is an abstraction over
the responses/requests. We have the handle to the queue to get the
relevant information.
If i am to associate a IO Completion port with this, does that mean that i
have use the queue as the handle? Will this not reduce the granularity?
Can't i associate a IO Completion port with each request rather than with
the complete queue.
Detailed Query: We register for certain URL using a request queue in
windows http server api. So there maybe lots of requests on a queue. How
can i associate a IO Completion port with the each request/response rather
than with the Queue itself.
IO Completition:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa363862(v=vs.85).aspx
Queue Documentation:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364483(v=vs.85).aspx
Receive a Request:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364495(v=vs.85).aspx