The reference configuration is a feature of iControl Solo that allows you to keep track of important cards, or groups of cards. If a card is removed from a slot, the default behavior in iControl Solo is for the card to disappear from the list in the Logical and Global views. In the Network view, the device name is replaced by the slot number followed by the indication Empty.

When you to designate a card as part of the reference configuration, then the name of the card and the slot number it occupies are retained. If the card is removed, its label will be visible as before, but with the description Missing from slot appended.