the 7 stages of computer englightenment:

1. realizing there is such thing as a "choose boot device menu"
2. knowing how to look up which key to press to launch the boot menu on your computer
3. knowing which key to press to launch the boot menu on your computer
4. knowing which key to press to launch the boot menu on your and all your family / friends' computers
5. knowing which key to press to launch the boot menu on every commonly-available computer
6. knowing which key to press to launch the boot menu on every computer ever made
7. knowing what time during boot to press the key to launch the boot menu so you can press it a single time and not have to hammer it like you're farming SP in the soda-guzzling contest in Chrono Trigger

(I am not convinced stage 7 is achievable by mortals)