We have a DNN site on which we need to display a registration form and credit card payment processor from another web app. The web app with the payment system is secured with a website certificate. We were thinking of using the IFrame to display the form and payment fields.

Would I need another certificate for the DNN sire with the IFrame?
If both sites have certificates, is the transaction still secure using an IFrame?

Thanks

Okay. If I place the web app at the end of the DNN domain I should be okay.

A related question, I noticed in other threads that a login via IFrame is not possible because passwords are passed via query string.
Is other form data passed the same way... for example a registration form that has name, address, credit card number, etc... is that passed from the Iframe to the registration form in a query string?

Also, as an FYI, I set up a test site using an Iframe and had the login page to a web app appear in the Iframe. I was unable to login using IE 7, but was able to login using FireFox 3.0.1 ...

I added an Iframe to a site and had one of our web apps login pages as the target URL.

When I used IE7 to access the page with the Iframe and entered the username and password I could not enter the web app.
When I used Firefox and went to the same Iframe page, entered the username and password I logged into my web app.

The Iframe is a module I've never used and wonder if there is a "How To" anywhere. I've read a lot of the threads and have a little (very little) understanding of it, but would like more. I'm particularly interested in how to use query string parameters.

Thanks for your help