here is the base thing about ipc :
http://mus.purplecloud.net/portlets/thesis/ipc.php
for what you want to do, I guess you'll have to manage something out of the JSR-168
...
may be with IPC by message (like in the library proposed on this site), you can have what
you want.
the only trouble is that the portlet will make the changes in the render phase.
(the action phase is always one and only one portlet involved).
hope this helps...
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