I'll explain my question through an example.
Assume I have written two custom modules as
A and B.
And both the modules are having observer functions which fires once click on the
'Place Order button in checkout flow. (Assume both observer functions fires at same event)
Assume each module's observer functions are
'a' and 'b'
So my question is how can I know which observer function will get invoked first ('a' or 'b')?
Is there any specific order? Or is there any possibility to inform Magento that we want to invoke method 'b' first and method 'a' next likewise?