Inter()

         Interchanges to variables

    Syntax:

         Inter( xVar1, xVar2 ) -> Nil

         xVar1 y xVar2 : The variables to interchange

    Description:

         Interchanges the value of the variables, that have to be indicated
         in the same way than an array {}.

    Return:

         Nothing.

    Example:

         cVar1 := "Hello"
         cVar2 := "Good bye"

         Inter( @cVar1, @cVar2 )
         ? cVar1                        // "Good bye"
         ? cVar2                        // "Hello"