| Value | Meaning |
|---|---|
| NONE0 | No scrolling. |
| JUMP1 | Jump to new location. |
| STEP_BACKWARD2 | Step backward. |
| STEP_FORWARD3 | Step forward. |
| PAGE_BACKWARD4 | Page backward. |
| PAGE_FORWARD5 | Page forward. |
| STEP_UP6 | Step up. |
| STEP_DOWN7 | Step down. |
| PAGE_UP8 | Page up. |
| PAGE_DOWN9 | Page down. |
| STEP_LEFT10 | Step to the left. |
| STEP_RIGHT11 | Step to the right. |
| PAGE_LEFT12 | Page to the left. |
| PAGE_RIGHT13 | Page to the right. |
| START14 | Scroll to start. |
| END15 | Scroll to end. |
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Scrolling types.