1- What exactly "avast! Community IQ" does?
The Community option allows avast to send data automatically to
the Alwil servers when avast detects an apparently new threat.
For example, if the heuristic scanner finds something suspicious
about a file that file can be sent automatically so it can be
analyzed and if it's a real threat then a new signature can be
created for it. One can opt out of this if they are uncomfortable
about files/data being harvested automatically from their computer.
As to dependencies, I'm sure that the shields will operate normally
even with this intelligence gathering turned off. However, the
opposite is unlikely - if a shield is disabled it won't detect
anything so there will be nothing to send to Alwil.
See the description in the Quick Start Guide {image}: