Simrad NSO Operation Manual page 11

Dialogs
Dialogs are used for entering user input or for presenting
information to the user.
A dialog may be presented in full-screen, or as a popup
dialog in the centre of the screen.
Depending on type of information or entry, different keys
are used to confirm, cancel and close the dialog.
Alarm messages
The NSO system will continually check for dangerous situations and
system faults while the system is running.
When an alarm situation occurs, the Alarm window will pop up.
If you have enabled the siren, an audible alarm will be activated when
any alarm situation occurs.
Refer to The alarm system section for further information.
10 | System overview