[Kirkus (Kirk)]

I've read in many places that multiple dark frames should be taken during a photography session of DSO's. Some people even take an equal amount of dark frames as they do light frames.

I'm having trouble finding how these multiple dark frames are combined into one master dark frame that can then be used on the individual light frames.

Is that how it's done or should a light frame be shot followed immediately by a dark then that dark subtracted from the light frame that preceded it?

The stacking software that I have, and others I've read about online, allow for the subtraction of one dark frame, not multiple darks.