Norton Commander (NC) was a prototypical orthodox file manager (OFM), written by John Socha and released by Peter Norton Computing (later acquired in 1990 by the Symantec corporation). NC is a file manager which provides a text user interface on top of DOS. It was officially produced between 1986 and 1998. The last DOS version of Norton Commander, 5.51, was released on July 1, 1998.A related product, Norton Desktop, a graphical shell for DOS and Windows, succeeded Norton Commander.