WordPress Admin Notepad is a plugin for wordpress 3.0+ that allows selected user group to view or edit notes as long as they are logged into admin panel.
WordPress Admin Notepad automatically creates a show/hide notepad toggle at top right corner (beside log out link) so that users can access their notes at anywhere.
WordPress Admin Notepad supports ONLY WordPress 3.0 and above, that is after wordpress added Roles & Capability.
What’s New
<ul>
<li>You can now configure the permission to view or edit the notes for the 4 user levels (editors, author, contributor and subscriber).</li>
<li>You can now save the state of notepad (visible or hidden)</li>
<li>Notepad now supports cyrilic texts</li>
</ul>
Features
<ul>
<li>Allows selected user groups (roles) to edit/view notes at anywhere in admin panel</li>
<li>The toggle at top right corner can be disable</li>
<li>Save the state of notepad (visible or hidden)</li>
<li>Configure the permission to view or edit the notes for the 4 user levels (editors, author, contributor and subscriber)</li>
<li>Size of notepad can be personalized (slim or normal) and will be saved using cookie</li>
</ul>
<a href="http://zenverse.net/wordpress-admin-notepad/" rel="nofollow ugc">Plugin Info & Homepage</a> | <a href="http://zenverse.net/" rel="nofollow ugc">Plugin Author</a>

WordPress Admin Notepad

Add a Notepad to your admin panel so that you can view or edit note at anywhere.

WoPo Web

Microsoft Notepad clone for website
You can add shortcode [wopo-notepad] to page you want to show game windows

WordPress Admin Notepad vs WoPo Notepad