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(viper)Undo and Backups

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Undo and Backups
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   Viper provides multiple undo.  The number of undo's and the size is
limited by the machine.  The Viper command `u' does an undo.  Undo can
be repeated by typing `.' (a period).  Another `u' will undo the undo,
and further `.' will repeat it.  Typing `u' does the first undo, and
changes the direction.

   Since the undo size is limited, Viper can create backup files and
auto-save files.  It will normally do this automatically.  It is
possible to have numbered backups, etc.  For details, Note: Backup and
Auto-Save.

   The results of the 9 previous changes are available in the 9 numeric
registers, as in Vi.  The extra goody is the ability to _view_ these
registers, in addition to being able to access them through `p' and
`M-y' (Note: Insert State, for details.)  The Viper command `]
register' will display the contents of any register, numeric or
alphabetical.  The related command `[ textmarker' will show the text
around the textmarker.  `register' and `textmarker' can be any letters
from a through z.