A wheelchair lift for a vehicle having a barrier moveable between an access position and a blocking position. The alignment region may be defined by a plurality of alignment features aligned along a first axis. The first, third and fifth switch device can be controlled by the first switch clock pulse, and the second, fourth and sixth switch device can be controlled by the second switch clock pulse. Further, a configurable area associated with the screen that displays the window is maintained during the desktop reveal and the return of the window. The access instructions newer than the fencing instruction are stalled.