In the Editor, Undo can reinsert any characters you delete, delete any characters you insert, replace any characters you overwrite, or move your cursor back to its prior position.
You can undo multiple successive actions by choosing Undo repeatedly. This undoes your changes by "stepping back" through your actions and reverting them to their previous state. You can specify an undo limit on the Editor page of the Environment Options dialog box.
If you undo a block operation, your file appears as it was before you executed the block operation.
The Undo command does not change an option setting that affects more than one window. Check Group Undo on the Editor page of the Environment Options dialog box to undo a group of actions.
Cut replaces the current clipboard contents with the selected item. To insert the contents of the clipboard elsewhere choose Edit|Paste.
You can paste the current contents of the clipboard as many times as you like until you cut or copy new text onto the clipboard.
Delete is useful if you want to remove an item but you do not want to overwrite the contents of the clipboard.
Even though you cannot paste deleted text, you can restore it by immediately choosing Edit|Undo.