它们使用轨迹球移动指针和滚动屏幕，但是这更像是指针-键功能而不是鼠标指针。

They use a trackball to move the cursor and scroll the screen, but it is more like cursor-key functionality rather than a mouse pointer.

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注意：如果记录集对象不支持书签或不能向后移动指针，那么将产生错误。

Note: An error will occur if the Recordset object does not support bookmarks or backward cursor movement.

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和迭代器不同，不需要先移动指针（使用 next()）来进入合法的状态。

Unlike an iterator, the cursor need not be advanced first (using next()) in order to get into a valid state.

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