I'd like to update this post, as i'm perplexed on how to pass parameters using iframe querystring parameters (both querystring and form post). My example is that i'd like to pass a username and password to the following website using iframe....http://www.blogmasterprofits.com.  I realize the issues with password encryption, etc.  But for the sake of trying to get a working example, I want to pass the current user's DNN username as both the site login username and login password as well.  The DNN username is "test" and therefore the password is test as well.  These credentials currently work for the blogmaster site, so anyone wanting to take a stab at this..it will work. ANY help would be appreciated.

Assuming the iframe target is a DNN site.
Using an iframe tag, not the iframe module in this example.

If you are not concerned with the security of your login credentials, you can accomplish logging in the target of an iframe by putting an Onyaktech Login module on the iframe target page configured to allow SSO (single sign on). Then put your login credentials inside your iframe URL. For example,

[iframe src="http://yourtargetdomain/andpage?onyaktechsso=True&User=DNNUsernameHere&Password=PutPasswordHere" scrolling="yes" style="width: 100%; height: 1000px; border: none;"][/iframe]