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While booting with the Windows 7 Boot Manager, I have, by accident, triggered a screen which allows me to edit the boot command line, before the OS boots (similar to how GRUB allows you to press E and then modify the parameters on the fly).

I don't remember the key combination for this, though... or whether or not I needed to change any particular setting.

Does anyone know how to bring up this screen while booting?

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F8 maybe? Then one of the options from there – Journeyman Geek Dec 7 '11 at 0:24
@JourneymanGeek: No, I mean the screen that lets you type in the command line options (like in GRUB), not the old option selection screen that has been there for more than a decade. :P – Mehrdad Dec 7 '11 at 0:34
There is no command line until after Microsoft's Boot Manager has ceded control. The command line passed to the Windows NT kernel is constructed by winload, the kernel loader, in its AhCreateLoadOptionsString function. – JdeBP Dec 23 '11 at 19:35
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Ah... it's the F10 key, and it only works for certain (Windows?) boot options.

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