Invoking Workflows in one Orchestrator from another

Hi,

I am trying to integrate 2 different vCO. We have a vCO 5.0 and vCO 5.5 installation in our set-up.

I need to trigger the workflows in vCO 5.5 from vCO 5.0 . Is this doable? If yes, what is the best possible way to do this.