A nervousness that afflicts anyone who is not comfortable typing on a keyboard. Many CEOs in the early days of Web browsing experienced this because they had relied on secretaries to type everything for them (similar to the "ivory tower syndrome" of not knowing how much a stamp costs). This type of computer stress also extends to learning how to control the mouse and how to click within the correct areas of the screen.
Fortunately, people who teach others how to use a computer exhibit an altruistic patience. They don't want to make the new user feel dumb, but at the same time, they must control their natural urge to grab the mouse or take over the keyboard and show the person how it's done.