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Trying to install WinNT4 in VB on Mac OSX 10.13.6 and stuck at WinNT installation blue screen Licensing Agreement where you have to page down the screen before F8 is accessible to continue with installation.

How to get Page Down on Mac keyboard during this process?

Sorted by plugging wired extended Mac keyboard.

Great! Glad you kept up the hunt and found a solution!

There is also a "soft keyboard" provided by Virtualbox in the Keyboard menu.