How to boot Puppy from USB in UEFI computer with Win10

[oldaolgeezer]

Hi gychang:

Welcome to the world of Puppy !

(My other old computers have Puppy Linux and, if they have a hard drive,
Puppy plus WINXP. They all use fat32 or NTFS data format.)
I had no experience with VISTA, WIN7 or WIN8.
Because I didn't have a WIN10 DVD to restore a possible damaged WIN10,
I wanted minimum changes to my only WIN10 system.
For example, I didn't want to shrink the Dell Inspiron 3552 laptop's single hard drive
WIN10 partition to add a Linux formatted new partition.

I now use my three file flashdrive technique
(http://www.murga-linux.com/puppy/viewto ... 41#1038141)
and can boot any of the following Puppies via UEFI and that flashdrive's grub2 grub.cfg file:
xenialpup64_7.0.8.6 64 bit
DpupStretch RC4 32 bit
ScPup-19.09+7 Slackware Current 32 bit
xenial-7.5 32 bit
slacko64-6.3.2 64 bit
tahr-6.0.6 32 bit
bionicpup64-8.0 64 bit
fossapup64-9.0.1 64 bit
precise-light-5.7.2 32 bit
slacko5.7.0 32 bit (CAT5 cable only - no WIFI driver)

The corresponding vmlinuz, initrd.gz etc. files are all in first
directory of the hard drive's NTFS WIN10 partition in their own
Puppy version's folder.

If I don't hold down my F12 key during power up and select a Puppy
with the arrow keys, my WIN10 boots normally (no CSM involvement
either way.)

I don't know if any of the above is applicable to other brands of PC's.