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Switch the interal blog id used to create keys in blog specific groups.
<code style="color: #000000"> <span style="color: #0000BB"><?php wp_cache_switch_to_blog</span><span style="color: #007700">( </span><span style="color: #0000BB">$blog_id </span><span style="color: #007700">) </span><span style="color: #0000BB">?></span> </code>
wp_cache_switch_to_blog() is located in wp-includes/cache.php