Hier versucht ein ganzer Haufen von Autoren so detailliert als möglich die Frage zu beantworten, was geschieht, sobald man google.com eingegeben und Enter gedrückt hat.
To pick a zero point, let’s choose the enter key on the keyboard hitting the bottom of its range. At this point, an electrical circuit specific to the enter key is closed (either directly or capacitively). This allows a small amount of current to flow into the logic circuitry of the keyboard, which scans the state of each key switch, debounces the electrical noise of the rapid intermittent closure of the switch, and converts it to a keycode integer, in this case 13. The keyboard controller then encodes the keycode for transport to the computer.
Awesome.