I'm building a web application to create custom tabs and add them to the user's Facebook fanpages.

I know how the process of "installing" FB apps into FB pages so they show up as Page Tabs works, but the problem is the client wants to allow the user to create unlimited Page Tabs for a single FB Page. So I have basically two questions.

1 - Can I resue a single FB App to be included into the same page several times? If so, is there a way to know what is the "id" of that Page Tab?

So, if I have my FB App to look for the Tab content in http://www.mywebapp.com/tab/, I know I get a signed_request with the App ID and the Page ID, but if that same App is installed several times into the same Page, I don't know what's the Tab the user have cliked on.

I know it's a little big messy, and I don't think there's a way to do this. So my next question is probably more accurate.

2 - Is there a limit on how many Tabs can I add to a single Facebook page?

This way, if there's a limit of, say, 12 Tabs, I can create 12 FB Tab Apps, store the ID's and then I know which Tab of which Page the user is currently viewing.

Thanks in advice!

Maxi