How to load bios screen at startup?

I'm trying to access the bios screen at startup. This computer has the Mac side and a Windows PC side. I want to open the bios screen in the Windows PC side (if this makes a difference) so that I can change the booting options. Can someone please help!?

iMacs and other computers from Apple do NOT contain a BIOS like Windows machines.  They use EFI in place of the BIOS and it is not user accessible.  To select which OS you boot into you need to hold down the "Command" and "R" keys while starting up and this will then load the OS selection screen.
Hope this helps

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