[Continued]

"Computing" would take care of the business logic of today's applications, and a computing module would make a list of actions available to the system, that would handle data/files/databases.
This is somewhat related to unix's CLI utilities, but with typed commands (actions) meant for other software rather than text commands meant for people.

"Interface" would be generic widgets or specialized apps that use the actions of computing modules to help people achieve their tasks.