This method will add a specified item type to an object's in-use (USEITEM) list. Every workplace object in the system has an in-use list. The in-use list is a linked list of USEITEM structures which provides the object with important information such as the number of container (WC_CONTAINER) windows it has been inserted into. It also provides the number of open views (contents, help, and settings) of itself that already exist and how much memory it has allocated. The USEITEM structure consists of an item type and a pointer to the next USEITEM structure and is followed immediately by an item type-specific structure.