Correct me if I'm wrong - but a trigger required for everything?

[BeerHunter 0]

I was wondering if you can fire a script from anywhere or does it have to be attached to a particular trigger (or is that what the "Custom" in the command menus is for?).

ie What if I wanted to call an air strike/artillery from anywhere on the map on any target of my chosing rather than having to be in a predetermined location to activate a trigger. Can it be done?

[Beny.cz 10]

You can just make the trigger big enough to cover the whole map...

[shuko 45]

If you want to call air strike, that would probably mean using radio triggers (alpha, bravo and so on). They can be size 0x0 and still cover the whole map.

[Padjur 10]

Well you can call scripts several different ways depending on what's required, in waypoints or the init fields of units or in the init.sqf as well as triggers. But in this instance, as shk says a radio trigger would probably be the best, you might also want to make it repeated so you can call the arty strike again.