[intel352]

@Chris: google has search engine bots that harvest images, text, etc, and should all be detected as bots (assuming X-Cart's bots file works correctly). google *also* has a proxy bot that visits your webpage and caches the results.

There are theories that google will catch attempts to "lie" to the search engine bots, by comparing the search engine page cache against the proxy cache.

So if this is a concern to you, you can find the proxy IP addresses for google (which I believe *are* available online, I've seen mention of the IPs in the past), and add each IP to X-Cart's bot list.

My intention with this modification is to properly rewrite URLs, so that X-Cart still functions as it normally would, and where I can, I try to direct bots to the url that they should specifically see, to avoid duplicate content. There's pros & cons, because if you were to use x-cart without XC SEO, you would likely get penalized for duplicate content. But then if you use the XC SEO modification, you might get penalized for hiding info from google or whatever.

The choice is up to you. If it appears to be a bit risky, you might try looking into the commercial SEO modifications, in case their authors have input on how their own SEO mods handle search engines.