Toshiba Corp has developed Irex, an expert system support tool for general workstations, to be offered initially on Sun Microsystems’ Sun 3, which Toshiba sells as the AS3000; the Irex kernel is written in C so that general purpose programs can run unchanged; the program combines two artificial intelligence description modes, If…Then-type and frame knowledge expressions, built around a base of procedural knowledge expressions; set for delivery in the spring, it is not yet priced.