Popup mini window to record temporary ideas

Sometimes we would like to record a temporary sentences during reading, browsing or others. It’s convenient that there is a mini window stays beside and keep on top. for example:

  1. a simple keyboard-shotcut to toggle open/close, such as “Alt + Space”
  2. a window always on the top, to make edit easily during reading in other applications
  3. record the last edited location, and restore when open it