The Tracking option from Blue Integrator Explorer lets you examine active and suspended messages in more detail by clicking on that option in the Explorer interface:
The top of the Message Instances pane allows you to filter the results by schemas or display all schemas, as well as filter by the status of the messages. You could, for example, display all messages that are Awaiting Request for a particular schema by selecting those options from the drop-down menus:
When the results are displayed, you can see specifics of any message using the View button.
You can create Rules for handling failed messages within the Tracking system. See Message Rules for Failure Handling for more information.