Explanation

These articles describe the framework's core design: how retained views form an interactive desktop, how events become commands, how a frame reaches a terminal, and how the PHP API relates to Turbo Vision.

• The retained view tree — ownership, local coordinates, overlap, focus, and modal surfaces.
• The event and command model — physical input, event propagation, commands, broadcasts, and command availability.
• Drawing and terminal ownership — buffers, clipping, incremental ANSI output, terminal lifecycle, optional protocols, and headless rendering.
• From Turbo Vision to PHP — the classic concepts retained by the framework, PHP-facing API choices, and the scope of compatibility.

For a guided learning path, begin with the tutorials. For task-focused instructions, use the cookbook. For public types, runtime support, and exact contracts, use the reference.