VwpFAQGeneralImmediate
Why would I use the immediate setting on components like dropdown?
The "immediate" property is provided on UICommand components to control page flow through standard navigation rules while bypassing validation and update model values altogether. On UIInput components, "immediate" is provided to process validation earlier than normal namely ProcessValidations Phase.
You would use this setting if you have a use case that meets this criteria.
For a more detailed explanation of immediate see this blog:
http://blogs.sun.com/roller/page/jayashri?entry=purpose_of_immediate

