What does a Deputy Stage Manager do during performance in the UK?

During performances in the UK a Deputy Stage Manager (DSM) ensures smooth running of cues such as lights and other theatrical effects. They liaise closely with all members of the production team and provide a bridge between production management, the stage management and artistic teams who may sometimes be using different terminology depending on where they trained etc.

In other countries their position might be more appropriately labelled 'Master Of Cues.