This probably has the best explanation for you
https://www.jawa9000.com/Technical/ba...-rendering.htm
also if you want to see all the renderflags open a cmd shell and then type render -h and hit enter for a full list of options.
Also you can set up the render globals for the scene then save it, open the folder contianing it and right click and choose render to render the scene.
"No pressure, no diamonds" Thomas Carlyle