Sending Notices

When you send an informational message, the notice takes a one-way trip, as shown in Figure 8-1.

Figure 8-1 Notice Routing

The sending process creates a message, fills in attribute values, and sends it. The ToolTalk service matches message and pattern attribute values, then gives a copy of the message to one handler and to all matching observers. File-scoped messages are automatically transferred across session boundaries to processes that have declared interest in the file.