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# Undo redo

In each text window, every modification of the buffer is saved in an unlimited linked LIFO list. The modifications can be undone in order with the undo command Ctrl-u, up to the first modification. When the buffer is saved as a file, the undo list is reseted. It is possible to cancel one or several undo commands with Ctrl-t (i.e. redo).

The undo mechanism implemented in Xcoral is simple. It does not take into account context or semantics, but only modifications. This means that several Ctrl-u commands show you exactly what you have done in the buffer (i.e. inserted/deleted characters, copied/deleted regions, cut and paste with mouse, etc).