Wikipedia
SPFPC
SPFPC is a commercial file manager and text editor sold by Command Technology Corporation. SPFPC is similar to IBM's mainframe based ISPF. SPFPC v1.0 was released in June 1984. It has been continuously enhanced and refined through many releases. The current product is rebranded as SPF/SE 365.
It is one of several PC versions of the mainframe ISPF system, some commercial and some freeware versions. See the links for a list.