Triggering Outbound proxy through Output type

I am sending sales order Acknowledgement to a file sytem from SAP. For this I am using a outbound proxy. I have a output type say ZCCS created in SAP . My question is how will the outbound proxy will get triggerred.

what should be the medium type(Print,Mail,External send ...etc) in the output type. & where do I write my outbound proxy code ( I mean should it be a executable program).

Message was edited by: SACHIN KAGLIWAL