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How to find product and vendor names for xorg.conf

# Problem 

How do I find product and vendor names for use with a xorg.conf file?
Neither the `xorg.conf` nor the `xinput` manuals specify how to do this.

`xinput` lists info, but the output lacks column headers and the manual
doesn't specify.

# Have

```txt
/etc/X11/xorg.conf.d/00-keyboard.conf
----
Section "InputClass"
        Identifier "system-keyboard"
        MatchIsKeyboard "on"
        MatchVendor "Virtual core"
        MatchProduct "XTEST keyboard"
        Option "XkbLayout" "us"
        Option "XkbModel" "pc104"
        Option "XkbVariant" "dvorak"
EndSection
```

```txt
xinput
----
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ mek mek_42 Mouse                        	id=10	[slave  pointer  (2)]
⎜   ↳ mek mek_42 Consumer Control             	id=12	[slave  pointer  (2)]
⎜   ↳ Elan Touchpad                           	id=14	[slave  pointer  (2)]
⎜   ↳ Elan TrackPoint                         	id=15	[slave  pointer  (2)]
⎜   ↳ Logitech MX Master 3S                   	id=20	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Power Button                            	id=6	[slave  keyboard (3)]
    ↳ Video Bus                               	id=7	[slave  keyboard (3)]
    ↳ Sleep Button                            	id=8	[slave  keyboard (3)]
    ↳ mek mek_42                              	id=9	[slave  keyboard (3)]
    ↳ mek mek_42 System Control               	id=11	[slave  keyboard (3)]
    ↳ mek mek_42 Keyboard                     	id=13	[slave  keyboard (3)]
    ↳ Intel HID events                        	id=16	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=17	[slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                  	id=18	[slave  keyboard (3)]
    ↳ mek mek_42 Consumer Control             	id=19	[slave  keyboard (3)]
```

# Want

Want a dvorak layout to apply only to my laptop keyboard. Given the
`xinput` output, I believe this to be "Virtual core XTEST keyboard". I
don't know what of this is the vendor and product.

# Tried

I tried multiple combinations of the string in the vendor and product
places.

Things like
```txt
MatchVendor "Virtual core"
MatchProduct "XTEST"

MatchVendor "Virtual"
MatchProduct "XTEST"

MatchVendor "core"
MatchProduct "XTEST"
...
```

# Notes

The main reason I am trying this as opposed to putting a line in my
`.xinitrc` is that I don't want these settings to apply to my external
keyboard (see [this post](https://linux.codidact.com/posts/290170)).