An apparatus for displaying a plurality of two dimensional display regions (28, 29, 30, 31) including a currently displayed display region on a surface of a display (24), including display means (14) for displaying a pointer (50) on the display (24) at a location corresponding to X and Y coordinate signals generated by pointing means (10) and storing means (20) for storing the plurality of two dimensional display regions (28, 29, 30, 31 ), characterised in that said pointing means (10, 12) further includes means (12)for generating a Z increment signal; sequencing means (18) for determining a sequence of the plurality of two dimensional display regions (28, 29, 30, 31), said sequence including a first display region, a last display region, and intervening display regions, the currently displayed display region being one of said first, last, and intervening display regions, and said sequence having an associated forward direction beginning with said first display region and ending with said last display region and an associated reverse direction beginning with said last display region and ending with said first display region; selecting means (16) for selecting in response to said Z increment signal a display region succeeding the currently displayed display region in said forward direction of said sequence, a display region preceding the currently displayed display region in said reverse direction of said sequence, or the currently displayed display region and further display means (22) for displaying the plurality of two dimensional display regions on the display in accordance with said sequence such that said selected display region appears as a new currently displayed display region, and display regions succeeding said selected display region in said forward direction of said sequence appear overlapped by said selected display region in a third dimension normal to the surface of the display with each of said displayed display regions being displayed in its entirety except where overlapped by a preceding display region in said reverse direction of said sequence, said selected display region being displayed in its entirety.