La Crosse Technology WS-2010 Software Manual page 6

In order to enable extremely easy operation of the program, the buttons are
always located on the right side or at the bottom edge of the window. When
selecting or entering data, observe the functions of the following buttons.
Ok
Cancel
Close
6
After activating this button, the current window is closed.
The entries and settings made are stored.
After activating this button, the current window is closed.
However, the entries and settings made are not stored.
After activating this button, the current window is closed.
The entries and settings made are automatically stored.