Can conjured creatures act in the round they're conjured in?

Question

Specifically, if someone casts the Create Homunculus (Creation 26) spell, could the homunculus created thusly act immediately? Taken to extremes, this could well set up a budget grey goo scenario:

1. Person, carrying two items with the Automatic Spell power (Prometheum Exxet) bearing Imitate with an additional charge/Create Homunculus +1 Added Effect, exists and decides they want to bury the world in homunculi and magic items.
2. Using the charge of Create Homunculus on item #1, and buying magic projection on the homunculi, the caster orders the homunculi to activate the two charges of Imitate on the root item, and then activate Create Homunculus on the two items they just produced, and then order the homunculi the homunculi just created to do the exact same thing (recursively), and then get out of the way of the self-replication...

...Well. That might be a bit of an absurd scenario. But it's not, as far as I understand things, impossible.

Another, more reasonable example:

3. Caster with, e.g., an item of Create Monstrosity activates it, wants the monstrosity to attack the enemy immediately. Can the monstrosity do so?

Answer 1

Another, more reasonable example:

1. Caster with, e.g., an item of Create Monstrosity activates it, wants the monstrosity to attack the enemy immediately. Can the monstrosity do so?

At the above example. Yes. Action limits are your main limitation here. You have to individually order these creatures to do things. Unless given conditional orders (that could be repeated), they do nothing... The copies would have the standing orders from the previous copy though, which could cause issues.

All of these scenario's encourage your GM to use the chapter 26 (page 282) rule allowing them to spend 100-200 DP on these creatures.