Pascal,

I haven't read all the many replies to your question but I think I have just done somthing similiar:

1. In the INIT of your custom object, CREATE a dummy form object which has a private datasession.

DEFINE CLASS frmDummy AS Form
DataSession = 2
PROCEDURE Init
SET TALK OFF
SET DELETED ON
ENDPROC
ENDDEFINE

2. Have a pointer in your custom class to this form

3. Set the datasession to the dummy forms datasession

4. You can now open any tables you require and they will be in a Private data session.

5. Any methods of the custom object you call, will now be run with that data session.

HTH