Word processors never display a cursor. You never have to use the spacebar when typing long sentences. All monitors display 2 inch high letters. Those that don't will have incredibly powerful text-based command shells that can correctly understand and execute commands typed in plain English.
Viruses cause temperatures in computers, just like they do in humans.
After a while, smoke billows out of disk drives and monitors. All computers are connected. You can access the information on the villain's desktop computer, even if it's turned off. Powerful computers beep whenever you press a key or whenever the screen changes. Some computers also slow down the output on the screen so that it doesn't go faster than you can read.