I very much doubt Steve H is using a macbook/mbp in favour of his Octo-core Mac Pro to create tutorials ;-)
He might have had a different key command set. On my MBP and on test iMac machines (I used last week while facilitating the Logic 9 101 course) both using the standard US KC preset, Control + Command + left/right arrows navigate between markers.
In preparing yourself for your LP cert, you do NOT need to know key commands. This is because they can be altered on a per user basis. So, it's not about learning or teaching the 'wrong stuff' - but would be important to let students know that they can customise these commands...
However, there are certain "standard" KCs that work across the board that might be included in the cert test. e.g. when using the Pointer tool which modifier keys will enable the zoom tool, or the curve tool (for automation and hyper draw), etc. These are hard wired into Logic 8 and 9 and cannot be customised and as they are mentioned in the Logic 9 book are fair game to be included as questions in the test.
In Logic's KC window, under the Options menu you can import and export KC sets.
You can also initialise them (to return the current ones to their default set) and even copy your current key command set to the clipboard - so you can paste them into a text editor and print / save them.
Furthermore, when you export your kcs they are saved by default in:
Home folder / Library / Application Support / Logic / Key Commands /
Once you have saved them there, you will see they appear under the preset KC lists under the Options > Presets menu.
So, to cut a long answer... short ;-)
Yes, just copy the exported KC file from the above location to a USB stick and keep it handy :)