The notification window can be opened by performing a long touch on the screen (approximately 5 seconds) on the iPhone or by pressing the upper-right hand corner on the iPad.
This window will display messages that are deemed important to the operation. If you see a red dot, then it was a critical error and a yellow one represents a warning. Informational messages may be displayed here as well.
You can dismiss the window by pressing the arrow at the bottom of the screen or by scrolling the table up.