A message is a text string that is used to communicate information to the user—for example, an error message. CAS provides facilities for maintaining, building, and displaying messages.
Each message has a unique identifier and associated text containing an explanation of the message, the system action and the action that should be taken by the user when the message is displayed.
Variables can be included within messages. When a message is built the variables are substituted into the message to provide specific information relating to the message—for example, an error code.
CAS provides centralized control of messages. All applications call CAS to build messages for display.