Apple does like to hide things very well, I remember a long time ago (but after they had switched to x86, and all the news about Hackintoshing had me believe they were just branded PCs) I was asked to do some basic troubleshooting on a Macbook and spent quite a bit of time trying to figure out the key to enter the BIOS setup utility, only to find out later that there was none.
Meanwhile, my no-name Chinese mobo exclaims "Press F10 for BOOT MENU!!" (the uppercase and exclamation marks are verbatim) on its BIOS post screen, and nearly all the other PCs I've used have similar if less exciting messages. But with Apple, all you get is an Apple logo, and if you need to do anything other than normal boot, you had better have looked it up because it won't tell you.