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You found it. Now install it on your server, configure it and you can run it as a separate application from Xoops. Make a custom block with a link to it from your XOOPS site and that's the best you'll be able to do.
As for PHP4, you'll need that installed on your server also to run Noah's Classifieds. But if you're talking on a XOOPS forum and using Xoops, you're already running PHP.
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But that's not why I started this thread. I asked if anyone had tried to make a XOOPS module using Noah's Classifieds. From the response so far, I guess not.
As a separate application, your users will have to register and login separately with Noah to use it. Their XOOPS login won't work unless it's an integral module.
As a side note: Noah's Classifieds may be referred to as Noah and should not be confused with the new module available here called No-Ah (which name should be changed to avoid such confusion, IMHO).