DIEGO, another step towards a module concept for graph transformation systems. DIEGO graph transformation systems offer means for DIstributed programming with Encapsulated Graph Objects. Their operational semantics definition follows the lines of distributed graph transformation, thereby permitting the specification of distributed systems with concurrently interacting objects. Adapting previously made proposals for a graph grammar module concept and for graph models with information hiding to this setting, the new approach supports structuring of large specifications into small reusable modules with well-defined interfaces between them. Use relationships between export interfaces and import interfaces are our means to construct system architectures and to allow reuse of modules in different environments.