“…A number of systems (Tamura et al [28], Cheok et al [27], Piekarski et al [23], Papagiannakis et al [12], Hughes et al [32], Hollerer [8], Scmeil et al [40], Wagner et al [25] and Egges et al [11]) have employed mobile workstations (Figure 3), often aggregated together with other mobile equipment, in the form of a backpack (weighting 1-6 Kgs), so that the user can freely move in the real environment and have their hands free for input and interaction. These backpacks include amongst others, mobile workstations such as Dell™ Inspiron & Precision, Alienware™ and JVC™ sub-notebooks.…”