Create a report in a popup (validation needed in back bean before popup)

Hi all,
I am very new to JDev and ADF, I am struggling to generate a report in a popup through the back bean, some validation is needed in the back bean before the popup. When creating the popup window, the url of the popup will be the URL of a servlet I searched the forum and found 2 approaches:
http://thepeninsulasedge.com/frank_nimphius/2007/09/11/adf-faces-showing-reports/
can af:showPopupBehavior work together with action- or launchListener? (approach by Julian Stephen)
But I have a few questions for these approaches:
for first approach:
is “documentURL” in the commandButton_action() the url for the my report servlet,
another thing is that, in this commandButton_action(), it said: return "dialog:open"; But I couldn’t find anywhere in the content that shows dialog, open are component ids? Or I am misunderstood it?
for the second approach:
where is the url for my report servlet put? Is it in the "hints" in the function “popup.show(hints)”?
I can try the second approach first, but for the first approach I really want to know what is the "return dialogLopen" about?
If there are any other means, please let me know!
Your help is highly appreciated!
Shawn

My bad, in the first approach, "dialog:open" is the action string not component ids.

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