How to conditionally render LOV/Output text?

We have following requirement:
From task_flow1, user can navigate to task_flow2 on a button click.
If product_id parameter is not passed by task_flow1, in task_flow2 page we want to show a LOV allowing the user to enter the product.
If product_id parameter is passed, we want to show product as output text.
Can we do this using EL in rendered properties for LOV/output text attributes?
TIA

Thanks Frank/Raghu!
Frank, how to pass parameter to memory scope of the target task flow? where exactly should I check if the parameter exists? In EL for rendered property of LOV/Output text?
Raghu, I could not find "Dynamic user interface" in jdev guide. Can you please point me to specific section.
Thanks again!

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Message was edited by:
        Hoo Laa
Message was edited by:
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