I am mainly looking this feasibility from an On Demand environment.
Hard to do in On-Demand.
I am still playing around with an interactive portlet to capture the sessionId.
Yes we can invoke a process fom a portlet only HTML [as far as i know].
As we know that clarity has exposed the webservice to invoke the process (server\niku\xog\invokeactions).
Now i suppose i have cleared all the links , so all you need is to join these together.
And if you need a code i can help you providing that too.
Hope i had make some sense.
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