Since Proficy Portal is a web-enabled application, your users will connect to the Proficy Portal server via the server's URL.
One way to distribute the URL of your Proficy Portal server is to add a link to your organization's intranet. Since most users will already be conditioned to look at the intranet for new information, this is a very effective way of deploying Proficy Portal. A side benefit of this method is that you can change the URL of your Proficy Portal server later without having to inform all of your users: simply change the URL of the link on the intranet.
Alternatively, you can supply your users with the Proficy Portal server's URL through email.