Re: OpFire?
OpFire is firing on opportunity, e.g. when an enemy enters your field of vision, or you get fired upon and then return fire.
A unit opfires as long as it has shots remaining (IIRC), so it can be useful to not use every shot available and save some instead - particularly for AT guns or AT infantry teams. You can also use 'Y' to set the range in which a unit should opfire, really useful for ambushes or maintaining stealth on your scout units.
As far as realism goes... it's just that. Using an opportunity to fire on an enemy.
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