SETL with more conventional Ada-like syntax, lexicalscope, full block structure, first-class functions and a

package and library system. Ported to OS/2, MS-DOS (3.1

up), Extended MS-DOS (80286 and higher processors with

extended memory), Macintosh (with the MPW environment),

Sun-3 (SunOS 4), Sun-4 (SunOS 4), IBM RS/6000 (AIX 3.1), DEC

RISC product line (Ultrix 4.0), DEC Vaxen (Mt. Xinu Unix or

VMS).