This video describes limiting output message segments. Depending on how a transaction code is defined to IMS by IMS Systems Programmers, IMS can restrict both the size of output message segments and the number of message segments that can be ISRTed by an application within a UOW – usually since the latest GU to the I/O PCB for MPRs or since the latest CHKP call for BMPs. This video also describes wait-for-input, which is an option for a transaction definition that is intended for high-performance transactions.