While program execution sample

local program = "tree"
local text = "Press S to stop!"

local ready = true
parallel.waitForAll(
  function ()
    while ready do
      shell.run(program)
    end
  end,
  function ()
    while ready do
      local event, key = os.pullEvent("key")
      if key==31 then
        ready=false
        print("Stopping...")
        shell.exit()
--elseif key== /MOUSE RIGHT CLICK/ then print(text)
      else
        print(text)
      end
    end
  end
)