The Un-Do functions are used to "Re-Do" and "Un-Do" modifications to the file. Both functions have been broken up into two categories:
The Un-Do menu can be invoked be typing <U> on the keyboard and will display the following functions:
An "Event" is a single modification, such as Place Line, or Edit Pad.
All will affect all modifications in the Un-Do buffer.
Un-Do Event can be used to undo single events (or modifications) to the data file for the number of events in the undo buffer. Once any (or all) events in the undo buffer have been exhausted, the Re-Do functions can be used to re-apply the undun functions. Once the correct position in the files history list has been found any modifications will destroy the ability to re-apply undun functions. The following warning will be displayed: