Agentry development - HTTPXML steps / transmit

Hi experts,

I need some clarification on the options to use HTTPXML system connection and how the different steps are managed during a transmit. The case is with a custom backend, which works with SOAP web services and we will be using SMP 3.0.

My question is - if we have several steps for one transaction - e.g. update activity - when we execute the transmit, do we call one web service on the backend or each HTTPXML step means calling a separate web services on the backend?

Regards,
Denis