Business Process Component leverages BPEL Engine to provide a Process Choreograph Capability for BTT. WebSphere® Process Server is needed as a pre-requisite. Business Process Component is used in the application logic layer to execute application business logic, and it can be called from the presentation layer.
Business Process Component has no limitation on WebSphere Process Server BPEL Engine, which means that you can create a micro or macro BPEL process, and you can also use Staff activity provided by BPEL engine. But in order to use Business Process Component, you need to pass BTTSystemData to the BPEL process as a parameter, which is needed by Business Process Component to obtain BTT Context.