Logical Input Devices and Interaction

The logical input device model, as is adopted in the standardized graphics packages GKS, has been an accepted basis for producing device-independent graphics systems. However, when used in highly interactive graphical applications, the logical input device model does not provide sufficient support for a number of fundamental issues inherent to interaction. This paper reopens a discussion which questions the functionality provided by the logical input device model when brought in conjunction with interaction. In particular, the logical input device model does not support the notion of input/output symmetry.