Analogous to a text editor, this program supports being able to undo and redo edits. For example, suppose a measurement was accidentally deleted. The undo action could be executed to restore the deleted measurement. All the edits that are performed are stored in series. If 25 edits have been made, the undo action could be performed 25 times in a row. If however, 14 edits were undone and then a new edit performed then the edit chain would only have 15 transactions in it; the original 14 that were not undone plus the one new transaction. The addition of the new transaction had the effect of removing all the undone transactions that occurred after transaction 14.

If there are no edits that can be undone, the undo indicator on the toolbar will be grayed out . If there are edits that can be undone, the undo indicator will be enabled . If there are no edits that can be redone, the redo indicator will be grayed out . If there are edits that can be redone, the redo indicator will be enabled .