The Mini Pad is a tiny window to view/modify text on clipboard (clipboard content will not affect Pad's content, and Pad will not affect clipboard's content -unless you choose to copy/cut Pad's text to clipboard).
You may want to keep some text visible all the time.
Any changes you made, can be saved to a file.
If you're using Windows 2000, Windows XP, Windows 2003 or better, you may use Transparency to show the Pad window with a transparency effect (blend), you may change the transparency level moving the slider.
You may discard the Mini Pad at any time, just closing it's window.