Class Library Advice (C#)

Hi,
I have a piece of software which runs on a server.  The clients access this via a web browser.
The software itself includes a capability to extend it.  It does this by allowing code to be hung off of event handlers.
Normally this code is just a class library, things I’ve already done include interfacing to other pieces of software or writing logs when certain things happens

I’d now like to do something on the logged on event.  Basically I wish to display ‘something’ (web page / form, etc…) on the client machine.
The problem is I’m not even sure is this is feasible with just a class library?  Is it also thwarted by the fact that it would be only be possible to display something on the server and not on the client machine itself?

Any thoughts / suggestions much appreciated.
andyw27Asked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
I would make a webservice.

Pass your parameters (if any) to the webservice from the client (could be the web application or windows form app).  The webservice would invoke the 3rd party part, and then pass a response back.  (Could be some unique class or a string).

From there the client would need to process the response, and then you could display your message with an alert, messagebox, or updating a control on the form.
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