Field Definition: - `POS=(row,col)` — Screen position - `LENGTH=n` — Field length in characters - `ATTRB` — Field attributes: - `ASKIP` — Auto-skip (read-only, cursor skips over) - `UNPROT` — Unprotected (user can type in this field) - `BRT` — Bright (high intensity) - `NORM` — Normal intensity - `D