A disclosed polarization beam splitter is effective when light to undergo polarization-splitting has an incidence angle that falls in a range of 54 degrees through 66 degrees. The AIMD has a conductive equipotential surface to which the EMI shield may be conductively coupled. The stand tracks the motion of an input device within an interactivity zone. The plug is threaded into the passage over the guide wire until the plug is disposed adjacent the wings. The standards’ linked ends might be slid up high along the sides of the writing board, and swung back a little, to prop the writing board in the manner as a book easel.