odoo_source/addons/board/board_demo.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
    <!-- set the default homepage of demo -->
    <record id="base.user_demo" model="res.users">
        <field name="action_id" ref="board_homepage_action"/>
    </record>
</data>
</openerp>