Many times we see the Captain of a Starfleet vessel ask for a probe to be launched in order to scan/examine some debris/star/anomaly/planet etc. Then a member of the crew, usually at the science or tactical stations, press a few buttons on their panels and moments later the probe is launched.
However, we never see what happens from the moment the crew "orders" the probe (by entering some command in the panel) and the launch itself. Does the command get forwarded to some crewmen in the lower decks who are responsible for maintaining the probes, who then load them and proceed with the launch or does the whole thing happen "automagically"?
So, my question is: are these probes loaded and launched manually or automatically in Starfleet vessels?
I'm only interested in the TNG era (TNG/DS9/VOY) and in both canon and expanded universe.