System Message Implementation 
You can add a message to the System Message section of the Home component.
You are an administrator or a user assigned to an application group with Create/Edit Contexts permissions. If Contexts is unavailable to you, it means you do not have the correct permissions.
You have created a context. For more information, see Context Development.
You can do the following to set a system message in the Home component:
(Required) Select a context to specify the system message for the Home component in that context.
Add, remove, or edit a message that appears in the System Message section of every user's Home component.
Any user with access to this context and to the Home component see this message in the Home component.
To add, remove, or change a system message on every user's Home component, choose Add System Message from the Context section.