The teaching of STEM subjects, and engineering and mathematics in particular, involves the use of a wide range of representational forms, including equations, diagrams, sketches and graphs, supported by speech and gestures. In the traditional face-to-face ‘board’ based classroom, the integration of writing, speech and gesture has been a key feature of pedagogical delivery approaches. The pen-enabled Tablet PC (penTPC), used in conjunction with a data projector, allows for the maintenance of a handwritten approach in teaching environments where traditional boards are unavailable or limited. However, it has been suggested that the use of the digital interface imposes restrictions on lecturer movement and gesture, compared to traditional board environments. This article examines the adaptations made by lecturers in using the penTPC in a classroom environment. The study suggests that the use of penTPC technology does not preclude the use of gesture, and that the augmented capability for annotation in conjunction with other digital representations can enhance teaching, particularly of STEM-based discipline subjects.