I found several solutions for creating Flash LSOs from JavaScript (for example: <http://www.nuff-respec.com/technology/cross-browser-cookies-with-flash> )
If Page (www.hostA.com/index.html) and the .swf file are from the same site, everything works fine.

No I'm trying to load the page form www.hostA.com/index.html, which includes www.hostB.com/flashcookie.swf (different sites). But then I cannot read or store the LSO.

I have tried several configurations (crossdomain.xml, Security.allowDomain("...") ), but nothing works.

Is this kind of cross domain access to a LSO possible?

Can a flash based advertisement delivered by a 3rd party save a LSO on my disc? 

Thanks
 -stephan