Set HTTP Proxy using VB.NET

Hi,

I am working on an application in VB.Net. I am stuck at a point. I am trying to set System Wide Proxy Server and Port so any internet traffic that goes from the system should use that.

I tried using Registry Keys but that only does settings for Internet Explorer not for Firefox or other browsers. 

I would like to know, is there any method to set system wide (global) http proxy.


Regards,
Mudasir Mirza.