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The purpose of the BIOS password (both supervisor and user) is to prevent access to the BIOS set up menu only. It will not prevent booting up into the Operating System (OS).
I see, I asked because I saw that the BIOS of another motherboard manufacturer also had supervisor and user BIOS passwords but one of them (user) controlled also booting into the OS.
See the Technical Product specification document for your board. For example, for the DZ68BC board the document is
In this case, a detailed description of the functions of the two types of password is found on page 76.