Spotlight screen saver.
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 Syntax

        GT_SpotLight([<nDelay>]) --> NIL

 Arguments:

      <nDelay> is an optional numeric parameter that is the delay to
      use when updating the display. This is in 1/18ths of a second.
      If not supplied this parameter defaults to 2.

 Returns:

      Nothing.

 Description:

      GT_SpotLight() is a screen saver function.

 Examples:

      // Call the screen saver with a delay of 3/18 of a second.

      GT_SpotLight(3)

 Source: SPOTLITE.PRG

 Author:  Dave Pearson