System items are items that are created automatically by the operating system, such as folios and device drivers, and thus do not need to be created by tasks. To use a system item, a task first opens it by calling OpenItem(). When a task is done using a system item, it calls CloseItem() to inform the operating system that it is no longer using the item.
Arguments
i
Number of the item to close.
Return Value
The procedure returns 0 if the item was closed successfully or an error code (a negative value) if an error occurs. Possible error codes include: