| 摘要 |
<p>PROBLEM TO BE SOLVED: To redo/undo a previous work even after closing and reopening a file or after ending and reactivating an application. SOLUTION: A computer-implemented application 1 is provided with an input/editing part 11 and a work history management part 17. The input/editing part 11 opens the editing file 7 of a disk 5 specified by a user by using an input device 3, displays it at a display device 9 and changes the contents of the editing file 7 in response to the input/editing work of the user using the input device 3. The work history management part 17 prepares one redo file 13 and one undo file 15 for each work unit of the input/editing work of the user and preserves them inside a disk 5. As many input/editing works are performed, many redo files 13a, 13b, 13c... and undo files 15a, 15b, 15c... are stored in the disk 5.</p> |
