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The Undo button in the Modify Menu reverses the operations
performed in the current cell. These operations can be undone as long
as the present cell is the current cell. Undone operations can be
redone with the Redo command. Pressing the Tab key has
the same effect as clicking on the Undo button, and Shift-Tab is equivalent to Redo.
The Undo Button: Undo Operation
By default, the last 25 operations can be undone. This can be changed
with the variable UndoListLength, which can be set to a
non-negative integer with the !set command. This sets the
number of operations that are remembered. If set to zero, the list
length is unlimited.
When Xic is waiting for text input to the prompt line, the Undo and Redo commands are disabled.
Stephen R. Whiteley