Get BIOS boot loader only to use fixed media

[Michael4313]

I guess I'm looking for tips.

(1) On computers at work, how do I set up BIOS (or another controller) to use only a boot loader installed on fixed media? What messages should I look out for etc. I know what a floopy and a USB are! (I know this involves typing a certain key or key sequence and looking for Boot options.)

(2) How do I verify that BIOS is only booting from fixed media?

This is all I know.

Thank you,
Michael