Mixed Reality (MR) technologies are increasingly used in engineering education to enable, e.g., virtual laboratory training. Yet, most applications support only individual learning, offering limited opportunities for teamwork and communication. This work-in-progress introduces an MR application that allows both local and remote collaboration, enabling two users to interact with the same virtual setup - either co-located or connected online - while sharing synchronized device states and interaction awareness.

The system integrates technical, linguistic, and cooperative dimensions within one immersive environment. In a joint bilingual course, German and U.S. students engage in problem-based laboratory tasks, alternating between English and German. The multi-user architecture embeds collaboration and language use directly into technical training, fostering engagement, co-presence, and teamwork. By shifting MR from isolated practice toward shared laboratory experiences, this approach provides a transferable model for communicative, collaborative learning in engineering education.