Extend the capability of the the \ref command: whenever a label is set this package records, along with the label, the values of some other counters (which, can be selected by the user). Then, the value of these counters can be recalled with a command similar to \pageref. Moreover, this package adds a command (\s[name]ref) for each counter added that displays something only if the value of the [name] counter is changed from when the label is set. The author is Giuseppe Bilotta.