How to use the Notepad

 In the text version of IDA, you can use the following keys:

Enter          starts a new line
Ctrl-Enter     finishes the input
Esc            cancels the input
F1             gives some help

                                       Shift-  Select
Ctrl-L         Search Again            Shift-Ins       Paste
Ctrl-O         Indent Mode             Shift-Del       Cut
Ctrl-T         Delete Word             Ctrl-Ins        Copy
Ctrl-U         Undo                    Ctrl-Del        Clear
Ctrl-Y         Delete Line             Ctrl-K B        Start Select
Ctrl-Left      Word Left               Ctrl-K H        Hide Select
Ctrl-Right     Word Right
Ctrl-PgUp      Text Start              Ctrl-Q A        Replace
Ctrl-PgDn      Text End                Ctrl-Q F        Search
                                       Ctrl-Q H        Delete Line Start
                                       Ctrl-Q Y        Delete Line End

Input containing only whitespaces is equal to an empty input.

Do not forget that you can also use the clipboard.