OpenWindows ToolTalk messaging is compatible with the CDE ToolTalk Messaging Service. In addition to the OpenWindows ToolTalk functionality, the CDE ToolTalk Messaging Service provides:
The tttrace utility is a debugging tool that helps monitor ToolTalk API calls and ToolTalk's internal message processing.
The ttsnoop utility is a debugging tool that helps monitor messages that are sent between your application and other applications.
See Common Desktop Environment: Programmer's Overview, Common Desktop Environment: ToolTalk Messaging Overview, and the tttrace(1) and ttsnoop(1) man pages for more information on the CDE extensions of ToolTalk.