Silent Login/Authentication from browser app.

We are using RoboHelp Server for our help system.  RH9

We plan to ship a Silverlight application that will be servered up from Asure and from our clients own servers/domains.  We are hoping to host the help from our own internet facing servers.

Since our help content is very detailed and comprehensive, we need to have the help in a protected area.  (With RH server reporting features, we can quickly respond to our end user needs.  This will be really cool and cost effective.)  BUT, since we will have 10k users hitting the server, we do not want to maintain an AD and raise the cost of operations.  So we would like a way to have a link in our Silverlight application to point to the Robohelp server hosted our domain and silently authenticate because, we do not want to one password that everyone knows, but if they are running our application, that they have the authorization to access the help.

I have looked at the samples and the REST examples and have successfully used them, but I do not see a way to get the help to launch in a browser window without the user being prompted to login on the administrator login screen.  Is there a way to authenticate silently so that the login screen does not display?

Is there a way to replace the login screen with a 'company/product' themed screen if we can not automate the authentication?

TIA  John E