| Field | Computer usage |
| Went Obsolete | 1997+ |
| Made Obsolete By | The mouse wheel |
| Knowledge Assumed | Moving the hand to the right side |
| When useful | To navigate vertically in a computer document |
Before the advent of the mousewheel, scrolling down computer documents required the user to point and click on the arrows located around the vertical scrollbar. Nowadays, the scrollbar is merely an indicator of the size and current position in the document, as people use mouse wheels to scroll up and down documents. (Except for when they don't have a wheeled mouse, of course.) http://en.wikipedia.org/wiki/Scrollbar