I have a site based on DNN 3.x.x that also has an events calendar that was built using ASP.net but outside of DNN (none of the existing modules suited my needs).  The calendar doesn't require a user to be logged in to view but DOES require logging in to post events.  I have been unsuccessful in finding someone who can provide a SSO solution for me and so users who want to post events have to create a second log on id and password which gets confusing for them.  So my question is this...

Is there a way for me to sort of insert the page created for posting events within the DNN framework - say, through an iframe - and then make that page only viewable to those users who are logged in?  Basically setting the permission for the page to be viewable only by those who are logged in.