In human–computer interaction with CRT or display screens, direct operator interaction with the displayed region is accomplished via which device or interface?

Introduction / Context:
Direct manipulation interfaces let users interact with on-screen objects without intermediate devices. The quintessential example is the touch-sensitive display, where the user’s finger (or a compatible stylus) contacts the screen surface to make selections, drag items, or invoke commands.

Given Data / Assumptions:

• “Directly with the CRT” means input occurs on the screen surface itself.
• We compare various input devices and internal display mechanisms.
• Touch technology can be resistive, capacitive, infrared, or surface acoustic wave.

Concept / Approach:
A touch terminal integrates a touch sensor over the display, providing immediate, spatially mapped input. This differs from a digitizing tablet (off-screen), vector scanning (a drawing method inside the CRT), or a separate stylus on paper. Touch enables intuitive pointing, selection, and gestures mapped to screen coordinates.

Step-by-Step Solution:

Verification / Alternative check:
HCI literature classifies touchscreens as direct-input devices with zero or minimal spatial indirection, validating the selection.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing pen displays (which are also direct) with generic styli on paper; the key is input on the display surface itself.

Final Answer:
A touch terminal (touch-sensitive screen)