Current choreography-based approaches to the specification and implementation of distributed systems lack support when it comes to program understanding. In particular, we miss systematic methodologies and algorithms to take a message-passing program written in a mainstream programming language and automatically produce a global description of all its communication behaviors. This helps understanding the program interaction patterns and also highlights possible unexpected behaviors to support debugging. We discuss the requirements and difficulties of the approach we envisage. Through concrete examples we outline the kind of global descriptions we want to obtain.