At the time of BEA ALUI, their were some sample portlets available on http://dev2dev.bea.com/aluserinteraction ..which is not accessible now...could you please know if the samples are still available??
they used to be at samplecode.oracle.com i will try to keep looking and let you know if i find them. i have them locally but probably do not have the documentation on installing them. you can view a slide deck on the functionality below.