In reading  http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_om_outboundmessaging_setting_up.htm, in particular the section on Downloading the Salesforce.com Client Certificate, I was wondering if the certificate that is generated by that link is unique to each organization?

Or to put another way, if I'm developing an application that is to be installed by customers, how would I store a certificate that can be used to securely connect to our external server(s)?

Thanks,

Eddy