Hi, I working with one of the application developed in java and using log4j for logging. It has also been configured for chainsaw tool of Apache. When examining logs for through chainsaw, I noticed that there is a column called as NDC (nested diagnostic contexts). This is printing some text while at some events (Which I am not able to figure out, what kind of event). Also I noticed that when some text is printed in NDC the category for log is "Transactions". I want to know under what condition this log will be printed and how and from where log4j picks up the string for NDC and prints it on the logs.