The Support Element (SE) is the box that actually controls the processors within the mainframe complex. The HMC, however, is a consolidation point that provides a single point of control for multiple CMOS processor complexes.
CA OPS/MVS can use the OPSHMC REXX program in two ways:
When the HMC is used as an intermediary, the command goes to the HMC and then is reissued (by the HMC) against the SE. When the SE responds, the HMC receives the response and then forwards it to CA OPS/MVS.
Using the OPSHMC REXX program directly against the SE increases efficiency by eliminating HMC as a middle-man which significantly reduces the network traffic necessary to perform a function.
The SE provides GUI dialogs that perform the same functions as those of an HMC and that look almost identical. The application programming interface (API) for performing system maintenance activities is identical to that of the HMC.
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