The document camera can’t show to virtual students when selecting it as a source on the lectern, instead you have to use the computer such that whatever web conferencing tool you use will distribute the view to the students. The concept is the same whether it’s Mac or PC, but the software might differ. Software on the computer has to be engaged that shows the doc cam on the monitor. This could be a camera app that the Mac has if the doc cam is new enough to be recognized by the Mac as a webcam, or the MS Camera app on a PC. If it’s an older doc cam it might be software specific to that model doc cam (Imagemate most likely).
Using this software on the computer, you can project the computer screen for those in the room, and share your screen via a web conferencing tool for the remote students.
Media Services provides the ImageMate manual for older Elmo Document cameras:
/kb_upload/file/Image%20Mate%20Software%20Manual.pdf
