This DD statement points to the

hlq.logger

.USERLIB data set, which is created during the installation of PowerExchange. This data set contains the EDMSDIR module, which defines the default Agent ID and Logger name and is used to initialize services required by the Log Read API. PowerExchange uses the Log Read API (LRAPI) to access the change data captured by the DB2 ECCR and recorded by the PowerExchange Logger.