How do I make a program run on a monitor AND a computer at the same time?

This is the code

conventinal = ("1337")
heavy = ("2448")
print ("ENTER LAUNCH CODE FOR THE HEAVY OR CONVENTINAL MISSILES")
input = read()
if  input == conventinal then
rs.setOutput ("left", true)
elseif input == heavy then
rs.setOutput ("right", true)
end
print("Launching!")
sleep(5)
print("Action Completed (Assuming the code is correct)")
sleep(5)
os.shutdown()

I need someone to please edit it so it'll do what the title says.
Thanks!

a monitor is just an extension of a computer, you use monitors to show something on a computer without going into the computer's UI

I don't remember the exact code for monitors or i would show you, sorry

Ok, but how do I change my colors?

the color of the text? its part of the monitors api, which I don't remember the code for, try the help program and seeing if it has anything about monitors

I put something about the monitor API on the wiki, on the peripheral page. Just m = peripheral.wrap("side of monitor"), m.write(whatever)