Palm VII - Manual (Page 168)

Page 160 Query Applications and the iMessenger™ Application
Pop-up menus
In the iMessenger List screen, tap the icon (a dash, check mark, or
diamond) at the left to open a menu of commands that you can use in
the current context.
Message menus
The Message menu varies depending on whether you are viewing a
message, creating a message, or viewing the iMessenger List.
Tap to open
pop-up
menu
iMessenger List
New Message
View Message