IWM4MSTR macro — Indicate the start of a work unit

The purpose of this service is to indicate that a work unit is beginning execution. The work unit runs under the specified monitoring environment, but is reported to EWLM completely independent from a potentially running transaction on the same monitoring environment that is defined by IWM4MINI and IWM4RPT/IWM4MNTF calls. You can use the set of services IWM4MSTR, IWM4MSTO, IWM4MUPD to provide data for "mini work units" running within a long-running transaction.
In addition a work unit started by IWM4MSTR can participate in asynchronous and synchronous work unit flows.