Human–computer interaction: Which computer input device allows operation without relying on the keyboard, enabling point-and-click selection on a graphical interface?

Introduction / Context:
Modern graphical user interfaces provide multiple input methods other than typing. The question asks which device specifically enables common desktop interaction without using a keyboard.

Given Data / Assumptions:

• Standard desktop environment with pointer-based UI.
• Goal is to 'dispense with' keyboard usage for typical navigation and selection.

Concept / Approach:

The mouse converts two-dimensional hand motion into cursor movement, supporting clicks, drags, and context menus. This device, more than any other traditional peripheral, enables complete navigation without typing.

Step-by-Step Solution:

Verification / Alternative check:

Operating systems can be fully controlled with a mouse for launching apps, menus, and dialogs. Text entry still needs a keyboard, but navigation does not.

Why Other Options Are Wrong:

• Light pen: niche hardware used with CRTs; not common.
• Joystick: not designed for general UI navigation.
• Touch interface: requires a touchscreen; not universally available on desktops at the time the question targets.
• None: incorrect because 'Mouse' fits.

Common Pitfalls:

• Assuming touch is always available; desktop PCs typically rely on mice.

Final Answer:

Mouse.