There is no neat distinction between operating system software and the software that runs on top of it.
That is the great distinction between the sexes. Men see objects, women see the relationships between objects.
There are six distinctive tigers Bengal, Indochinese, Malayan, Siberian, South China and Sumatran.
Again, most of the chief distinctions marked by economic terms are differences not of kind but of degree.
The distinctions between Virginians, Pennsylvanians, New Yorkers, and New Englanders are no more. I am not a Virginian but an American.
In the sky, there is no distinction of east and west; people create distinctions out of their own minds and then believe them to be true.
There isn't any distinction between a reader and a writer - reading is so much a part of it.