StarCraft2: Can a ghost use EMP while sitting in bunker?
Can a ghost throw an EMP while sitting inside a bunker?
Solution 1:
No, you cannot use special abilities of units garrisoned inside a bunker, with the exception of stim packs. It's not even possible to individually- or group- select the units inside, though you can direct their fire by right-clicking.
I've just checked and stim is unique in that it can be activated on all units inside the bunker (as long as there's at least one unit inside capable of stimming).