Enter the single destination register, or a range of destination registers, to copy the source register to. If no destination register is entered, only a single register will be copied to.

Delete will remove the rule number shown in the "Showing" box. Insert will insert a new rule before the rule number shown, and is used for placing rules between existing rules. It is not necessary to use Insert to add rules to the bottom of the list or to define any rule presently having zero for a source register.

Entering zero as a source register effectively deletes the rule even though it will still appear in the list until deleted. Unused rules at the end of the list will always show zero as the source register. If you wish to prevent these from being displayed, reduce the number of rules enabled.

The number of rules enabled simply limits the scope of rule review so that you do not have to review a lot of unused rules.