The Sequence Numbers menu contains options for managing MarkMagic sequence numbers. A sequence number is a user defined numerical value that MarkMagic can manipulate and keep track of over time.  When a sequence number that you defined is printed on a MarkMagic label or form, it is incremented / decremented according to how it was configured and the value is then stored for later use.  Using MarkMagic sequence numbers is a great way, for example, to generate unique serial numbers and label counts.