The interaction pane allows you to enter Dylan expressions for evaluation in the context of the paused thread. (In some language implementations, an interaction tool like this is called a listener.)
See "Interacting with an application" on page 111 for a discussion of interaction.
The interaction pane also logs thread events that the debugger noticed (such as DLL loading) and debugging messages explicitly output by the thread (for example via the Functional-Extensions library's debug-message function).
The pane does not collect ordinary output from the application being debugged. Such output continues to go to its ordinary destination, such as the standard output.