How to implement SSO to non-SAP systems using SAP logon ticket?

Hello,

We would like to implement Single Sign On between our SAP Netweaver system and a Siebel which is a non-SAP system using SAP logon tickets.

Can anyone please give me some leads on this, in particular:

1. Is there a JAVA API or an SAP plug-in that can be implemented on the Siebel machine to extract the SAP logon ticket?

2. As the other machine might seat on a complete different domain, is it possible to implement SAP logon ticket without using cookies (perhaps through the HTTP header?

3. In case you think using SAP logon tickets is not the best solution here I would be happy to hear any other suggestions you might have.

Roy