The hwInventoryIndex of the hardware device that the item in this row is tied to. If there is no parent, this object should read 0. The base printer itself should only be used as a parent for devices that are integrated into it. ie RIP card, tray one, fax card, scanner. Items that are options such as extra input trays, external duplexers, and add on output bins should rate their own row with no parent. Examples: 5-bin mailbox The mailbox unit as a whole would be one row, with a parent of 0. Each of the mailboxes would be row, with the parent of each mailbox pointing back to the mailbox unit. Finisher The finisher as a whole would be one row, with a parent of 0. The options of the finsher; output bins, stapler, hole punch, would each merit an individual row with the finisher unit as the parent