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Never display different content to a spider than customers (AVOID OR GET BANNED)
This is often called cloaking because it is an effort to cloak what your site delivers in something that might be seen as more palatable to search engines. It can be very tempting to use cloaking, but while it might give you better results at first, search engines don't like it.
Don't Cloak Websites - Your Site Will Be Banned
Search engines want to provide a resource of information that is real, not something that has been doctored to give artificial results. When they discover that your site is cloaking, it will be removed from the search directory.