PL/I

In PL/I programs, you should include these DECLARE statements:

DECLARE ISPLINK    /* NAME OF ENTRY POINT          */
        ENTRY
        EXTERNAL   /* EXTERNAL ROUTINE             */
        OPTIONS(   /* NEEDED OPTIONS               */
        ASM,       /* DO NOT USE PL/I DOPE VECTORS */
        INTER,     /* INTERRUPTS                   */
        RETCODE);  /* EXPECT A RETURN CODE         */