Consider this scenario...
You have a *PGM or *SRVPGM made up of 300 separate modules.
You need to change 1 of them.
Now in order to use CRTPGM or CRTSRVPGM, you either have to have kept
around the other 299 *MODULE objects, or you have to re-compile the other
299 *MODULE objects.
The UPDPGM / UPDSRVPGM allow you to update the *PGM / *SRVPGM with just the
changed module, you don't need the other 299.
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