I'm not sure of what you are asking, but I guess a server action might do the trick. You can create a server action in OpenERP Settings »» Technical »» Actions »» Server Actions or creating a XML on your module. I'll leave here an example of a server action I'm using to send an email to user when an object reaches a certain status on a module I'm developing:

Note: This action is called from workflow

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="ir_actions_server_send_email_when_closed_nconf" model="ir.actions.server">
            <field name="name">Auto-email when request is closed, not confirmed</field>
            <field name="model_id" ref="model_generic_request"/>
            <field name="state">email</field>
            <field name="type">ir.actions.server</field>
            <field name="condition">True</field>
            <field name="email">object.requestor.email</field>
            <field name="subject">Your request object.name has been closed (not confirmed)</field>
            <field name="message"><![CDATA[
THIS IS AN AUTOMATED EMAIL. DO NOT REPLY.

Hello,

We are here to inform you that the request [[object.name]] you submitted on [[object.request_date]] with the following data:

        | Request - Details
        |=========================
        | Number: [[object.id]]
        |=========================
        | Responsible Person: [[object.responsible_name.name]]
        | Request description: [[object.request_description]]
        | Stating reasons: [[object.stating_reasons]]
        |=========================
        | Notes: [[object.notes]]
        

Has not been confirmed and is closed.

If you have any question, do not hesitate to contact your supervisor.

Thank you!]]>
            </field>            
        </record>
    </data>
</openerp>