Gets a pointer to an item.
void *LookupItem( Item i )
This procedure finds an item by its item number and returns the pointer to the item.
Note: Because items are owned by the system, user tasks cannot change the values of their fields. They can, however, read the values contained in the public fields.
The procedure returns the pointer to the item or NULL if the item does not exist.
Folio call implemented in kernel folio V20.
CheckItem
(), CreateItem(), FindItem(), FindNamedItem(), FindVersionedItem()