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  Name:     turbo() - get an extra 4-5% speed from your computer
  Usage:    <logical> = turbo(<logical>)
  Params:   logical variable, .T. to turn on, .F. to turn off
  Returns:  logical variable, .T. if turbo is on, .F. if it is off

 ---------------------------------- Example ---------------------------------

                 turbo(.T.)     && turns turbo mode on
                 turbo(.F.)     && turns turbo mode off
                 ? turbo()      && prints current turbo mode

  Note:     If you leave turbo() mode on when you exit your computer,
            it will be active until you reboot. Leaving turbo()
            active will not cause any problems. Some programmers
            use a little .COM program supplied in PC Magazine that
            slowed down ram refresh to gain an extra few per cent
            of speed. Turbo() is based on that program. However, be
            advised that slowing down ram refresh is not an exact
            science. Turbo() slows it down the minimum before
            memory errors occur (based on an IBM PC). However, if
            the computer has ram chips that are not in good working
            order, turbo() may find them for you. If during the
            course of executing your program you receive ANY parity
            errors, or unexplainable error messages from Clipper, stop
            using turbo() immediately. If you receive a parity error,
            you may want to check the integrity of your ram chips.
            Using turbo() is relatively safe, but please test it first.
            Obviously if you use an 80286 or 80386 based system, using
            turbo() is unnecessary.