Undo/Redo Last Change
Use this form to Undo the last change that you did from the administration
page (or redo the last change that you un-did from this page). Currently,
only one version of Undo/Redo information is kept, so you cannot undo/redo
multiple changes.
Note that the only modifications that can be un-done from this page are
to "system parameters" (such as deadlines, etc.). In particular you cannot
undo things like setting status of individual submissions or setting the
discuss flags of individual PC members.