Single Word Requests – Word That Describes Both ‘Encoding’ and ‘Decoding’

How about dualistic?

As in the Oxford Dictionary:

Theology .

a. the doctrine that there are two independent divine beings or eternal principles, one good and the other evil.

Seems appropriate to say that inflammation has a dualistic role.

Scope, as in scope of responsibility, is used to delineate the extent and limit of a person's responsibility or assignment.

scope Syllabification: scope Pronunciation: /skōp/ NOUN

1. The extent of the area or subject matter that something deals with or to which it is relevant: we widened the scope of our investigation such questions go well beyond the scope of this book.
2. The opportunity or possibility to do or deal with something: the scope for major change is always limited by political realities

http://www.oxforddictionaries.com/us/definition/american_english/scope