property Items.PrevSiblingItem (Item as HITEM) as HITEM

Retrieves the previous sibling of the item in the parent's child list.

TypeDescription
Item as HITEM A long expression that indicates the item's handle.
HITEM A long expression that indicates the handle of  the previous sibling item

The PrevSiblingItem retrieves 0 if there are no more previous sibling items. Also, please check the NextSiblingItem property.