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This function is essentially the same as update_option() but works network wide when using WP Multisite.
<code style="color: #000000"><span style="color: #0000BB"><?php update_site_option</span><span style="color: #007700">( </span><span style="color: #0000BB">$option</span><span style="color: #007700">, </span><span style="color: #0000BB">$value </span><span style="color: #007700">); </span><span style="color: #0000BB">?></span></code>
wp-includes/functions.php to wp-includes/option.php.update_site_option() is located in wp-includes/option.php.