| Interface | Description | 
|---|---|
| AlertService | 
 Contains methods pertaining to creating/deleting/voiding Alerts in the system Use: 
 | 
| MessagePreparator | 
 Interface that defines the message preparator's functionality. 
 | 
| MessageSender | |
| MessageService | |
| NoteService | 
| Class | Description | 
|---|---|
| Alert | 
 Alerts are the simplest form of communication. 
 | 
| AlertRecipient | 
 This class is essentially a wrapper for the user object. 
 | 
| Message | |
| Note | 
 Not currently used. 
 | 
| NoteType | |
| NotificationConstants | |
| Template | 
| Exception | Description | 
|---|---|
| MessageException | 
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