With each Processor having the ability to expose multiple different Properties and Relationships, it can be challenging to remember how all of the different pieces work for each Processor. To address this, you are able to right-click on a Processor and choose the Usage menu item. This will provide you with the Processor's usage information, such as a description of the Processor, the different Relationships that are available, when the different Relationships are used, Properties that are exposed by the Processor and their documentation, as well as which FlowFile Attributes (if any) are expected on incoming FlowFiles and which Attributes (if any) are added to outgoing FlowFiles.