As far as offline use goes, I managed to use HLO at a convention last weekend without a connection. To a degree, it worked.
I began by prepping when I did have a connection, opening a new browser tab for every page of HLO that I would need. Then during game I would just switch to the appropriate tab. Clicking things to get details on them generally still worked. I didn't try to change anything, so I don't know if that would work or not.
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