BW>> Actually the way it works, is that the BootManager partition doesn't
 BW>> get a drive letter, thus it is always hidden from the booted
 BW>> operating system..

 LP> But doesn't it have to be bootable to dos before OS2 is installed?

That's Dual Boot.  Boot Manager does not require DOS in any way.

Boot Manager is, essentially, a mini-operating system that lives in a
partition all of its own, that does nothing more than present a large blue
window on the screen listing the bootable volumes for the user to select a
volume to boot from, and then load and execute the selected volume's boot
sector.

 ¯ JdeBP ®

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