A thin film magnetic recording head is fabricated by forming a substrate from opposing ferrite blocks which have a ceramic member bonded between them. The apparatus includes a source of indicator light other than the primary wavelength, a first optical element for co-injecting the indicator light into the laser beam to form a co-propagating beam, and an optical or physical configuration enabling an operator to view light from the co-propagating beam. Inclusion of fluorine in the photovoltaic material increases its thermal stability. The responses of contestants, live show audience participants and remote TV viewers, as well as the rewards and the leaning credits, are electronically processed and appropriate credits are issued using print outs or magnetic media. Additionally, or alternatively, the dust cap may be configured to releasably engage an adjacent dust cap to join at least two dust caps together, and may include one or more mounting members for releasably coupling the dust cap to a support structure to thereby support the dust cap and any fiber optic connector releasably coupled to the dust cap from the support structure.