It's been awhile since I used script-builder, and I no longer have it in front of me to give you exact details, but I remember enough of how I set this up to push you in the right direction.
(a) From your vector, your command to send it to conversant would be 'converse ... passing VDN'
(b) All the channels of your conversant are assinged to One application which reads the VDN and launches the script you really want running.
(c) Within your first aapplication, you have a single table which consists of a VDN number, and it's corresponding executable script name.
(d) Your steps now consist of reading the table searching by VDN, then an execute statement to launch the corresponding script.
Hope this helps.