Recording a component means that the AssemblyLine will intercept every call to the connector instance used by the component. Recording a connector component for example, will record all calls to its connector instance methods like selectEntries, getNextEntry and so forth. The result of each of those call are recorded in the configured Sandbox database. The information recorded is the return value or the exception thrown by the connector.
To run a test session, create an AssemblyLine and add a file system connector reading data from a file. Add a script component that dumps the work entry. Then check the file system connector in this panel and select Run/Record on the Run button menu. After we have done that we can move the file it just read and run the AssemblyLine in Playback mode. You should see the same log output even though the file connector would normally abort since the file is no longer accessible.
Parent topic: Sandbox