Hi, in case it's still relevant, I've posted an example of how I've embedded a Qualtrics survey within an HTML file and used a MediaLab Custom Item to hide the continue button and use a password to allow the subject to continue. This particular example allows you to put a medialab experiment in the middle of a Qualtrics survey, but you could configure it however you want (Qualtrics first, Qualtrics second, etc).

You can substitute any external URL into the HTML iframe code (q1.html) to make this work. It doesn't have to be a Qualtrics survey.

http://support.empirisoft.com/showthread.php?t=5646

- Lillian