/sys$common/syshlp/helplib.hlb EDIT, /TECO, Qualifiers, /MEMORY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MEMORY (default)
       /NOMEMORY

    Specifies that the last file you edited with TECO, identified by
    the logical name TEC$MEMORY, will be the file edited if you omit
    the file specification to the EDIT/TECO command.