/sys$common/syshlp/HELPLIB.HLB  —  CRTL  remainder  Description
    These functions return the floating-point remainder r = x - n*y)
    when y is nonzero. The value n is the integral value nearest the
    exact value x/y. That is, n = rint(x/y).

    When |n - x/y| = 1/2, the value n is chosen to be even.

    The behavior of the remainder function is independent of the
    rounding mode.

    The remainder functions are functionally equivalent to the remquo
    functions.
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