func Init()
  fvar(old)
    if(Extern = 0)
      old = block.select(BLK_GLOB)
      println('Dim ', s)
    end
    if(isndef(Default))
      println(s, ' = ', Default)
    end
  if(old)
    block.select(old)
  end
end

func doStrCat
  if(linked(Result))
    println(s, ' = ', Str1,' & ',Str2)
    event(onStrCat, s)
  else
    event(onStrCat, Str1 && ' & ' && Str2)
  end
end

func Result
  if(linked(doStrCat))
    return(s)
  else
    return(Str1 & Str2)
  end
end