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  Name:     swap() - swap the contents of two variables
  Usage:    swap(@<var1>,@<var2>)
  Params:   variable <var1>, <var2> - variables to swap
  Returns:  nothing, but contents of <var1> and <var2> are swapped

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

                 m1 = "First"
                 m2 = "Second"

                 swap(@m1,@m2)

                 ? m1      && prints "Second"
                 ? m2      && prints "First"

  Note:     You must always use the @ sign in front of both variables
            for swap to work.