Weblogic Portal interview questions

The following are the Portal interview questions that ive used or kept or have been asked(in no particular order , and no answers either :) )
I do not include questions (e.g. what is a nested pageflow) that can be answered with google.
Also see Weblogic Portal interview questions - II

• In what situations can you not use a UUP ?. What factors determine choosing a UUP?
• What are the different techniques you can use for Inter Portlet Communications?. What are the pros and cons of each technique?.
• Would you choose 1 desktop with entitlements or multiple desktops? Why?
• What are the options for security in Weblogic Portal?
• Can you change a LookAndFeel at runtime ?, if so what are the alternatives?
• What is the impact of using AJAX in a portlet (out of the box or otherwise)?
• Why should pageflow variables be serializable?
• If your using a file repository for content and you have a webserver in front of the application servers who serves the static files?
• When do you use the refresh action?
• What happens if the validate method of your form bean throws an exception
• How do you use the struts validation framework with BEA pageflows?
• The BEA pageflow documentation mentions that there is only 1 current pageflow. And that the current pageflow is destroyed when a new one is accessed. is that accurate?
• What all features should a screen scraping portlet possess?

To be continued...