Ansible AWS "Cloud-Control" Modules: Clarification

[Robert Glenn]

From: http://docs.ansible.com/ansible/guide_aws.html

Whereas classically ansible will execute tasks in its host loop against multiple remote machines, most cloud-control steps occur on your local machine with reference to the regions to control.

Some of the AWS module documentation are implicit (e.g. http://docs.ansible.com/ansible/ec2_module.html) about the above, but none seem to be explicit (many seem to ignore the above completely). 

Does "most" here mean "all"?

Can someone clarify which cloud-control modules behave differently? 

Can modules requiring special treatment be designated as such in the documentation?

best,

Robert Glenn