You need to install the second wp with a prefix different from the first. The prefix is in the wp-config.php
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$table_prefix = ‘wp_’; // example: ‘wp_’ or ‘b2’ or ‘mylogin_’
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By default, this prefix is wp_, choose another: cr_, gb_,.. for the second wp and launch the installation
see here: http://www.in-my-catalog.com and two other wp blogs
