Memento is a Office Tools software developed by Tim Browse. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Memento:
Memento is a simple program to let you keep notes on your windows desktop.

Memento - How to Use:

1. Opening a new note

Double click on the Memento icon in the notification area. This will open a new note for you type into.

2. Handling notes

You can MOVE the note around the screen and resize it in the usual ways. Notes normally appear on top of everything else, but you can hide them by clicking the close icon - the note will minimise down to the Memento icon in the notification area.

You can delete a note by shift-clicking the close icon - Memento will Ask you if you are sure about this first.

If you double-click on the title bar of a note, it will fold up, leaving only the title bar showing. To reveal the note, double click the title bar again.

3. Opening existing notes

Left-click on the Memento icon and you will see a list of all your notes - choose the one you want to edit, and it will open for you.

4. Options

Right-click the Memento icon to get the main program menu, from which you can open the options dialog.

The options let you enable/disable coloured notes, and choose whether you want to have scroll bars on the notes, configure the HotKey, and so on.

5. And more.