An optical apparatus minimizes autofluorescence and stray light as well as leakage of excitation light and efficiently utilizes illuminating light from a fluorescence illumination optical system to allow observation of a bright fluorescence image. The content can include a vocal free recording and a subsequently recorded vocal track generated by a user. The operator wall retains a slidable operator having a seat adapted to engage a single stick of gum and push it partially through the dispensing slot. The receiver extension tube is telescopically received in the primary bore hole. The personal data sets of each of the PDA’s have personal identification codes assigned thereto and the server data sets of the server have server identification codes assigned thereto. Eligible contacts from other address books include those contacts that have e-mail addresses with the same e-mail domain as the user’s e-mail address.