VMS Help RTL Routines, MTH$, MTH$HTANH, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 h-tanh

    OpenVMS usage:floating_point
    type:         H_floating
    access:       write only
    mechanism:    by reference

    Hyperbolic tangent of the value specified by floating-point-
    input-value. The h-tanh argument is the address of an H-floating
    number that is this hyperbolic tangent. MTH$HTANH writes the
    address of the hyperbolic tangent into h-tanh.

 floating-point-input-value

    OpenVMS usage:floating_point
    type:         H_floating
    access:       read only
    mechanism:    by reference

    The input value. The floating-point-input-value argument is the
    address of an H-floating number that contains this input value.