Newton MessagePad: Caps Lock Appears As Line On Screen

When I am in the date application, there is a intermittent line in the top left corner of the screen. It's appearance has no effect on any operations. What does it do?
The line that appears at the top of the screen is a Caps Lock indicator. On the "soft" keyboard, if Caps Lock is left on, the small line appears in the upper left corner of the screen. In the notepad and names applications, the line gets hidden because windows on the screen cover it.
Published Date: Feb 19, 2012