Netscape allows the user to put "small red flags" next to "important messages" Flagged messages are usually important
Netscape Mail..., Sender, Subject, Date Window
To Add (or Remove) the Red Flags just "click-on" them with your Mouse. The Flags are "turned on" or "turned off" as you click the Left Mouse Button.
From the Netscape Mail Window Toolbar.., Choose Select Flagged Messages and Delete them using the Delete Key. ...or Move them by going to the Mail Window Toolbar..., choose Message Move (or Copy).
Usually..., Message Flags are used to identify "important" messages.