Modula-2 plus exceptions and threads developed by P. Rovner et al of DECSRC, Palo Alto CA in 1984. ["Modula-2+ User' s Manual", M-C van Leunen]. ["Extending Modula-2 to Build Large, Integrated Systems", P. Rovner, IEEE Software 3(6):46-57 (Nov 1986)]. (1994-10-21)