The aspects of Monitoring and Activation (sensory, chronological, etc.), Item Operation Forms (electronic, mechanical, etc.), Item Operation Interactions (access, bypass, etc.), and Targeting are used to set up powers and technological manifestations of Item Types. They are also key to Device/System Use skills.
As it applies to any specific skills that uses these ‘interactions’, proficiency grants an automatic Ease of Use bonus of +2 to Access and Operate.