With digiCamControl - a free, open source, Windows application - you can control DSLR cameras using a USB or WiFi connection, also known as tethered shooting.
DigiCamControl supports most Nikon and Canon DSLR cameras, as well as cameras from several other manufacturers. Check supported camera list
If you would like to contribute to a more comprehensive User's Manual for digiCamControl, let me know to get you started.