Infants are also, I've discovered, quite fond of the "peekaboo" game. The game is simple: Show them your face, then take it away. It's essentially two components: "I'm here," and "then I'm not." "I'm suddenly right in front of you, then mysteriously, not-so-much."...And while you're not there, they enjoy the anticipation of you coming right back in two seconds. (The first four hundred times you do it gives them a sense of the pattern.)
quoted from "Babyhood" by Paul Reiser of television's "Mad About You", page 173
Small children should be supervised by a caregiver when at a computer,
to ensure no accidents occur that could hurt the child and that no equipment gets broken.