Communication between two modules

How do you let two modules communicates under the same parent module?

[flushentitypacket]

I have the same question, but am having trouble with coming up with an example that would help us think about the problem.

Perhaps the answer is that two modules shouldn't be attempting to communicate (except for main importing the modules), and if your modules absolutely must communicate, they are better suited to become 1 module.

[zomars]

That's what sagas are for IMHO.