Adding to what Mark said, being a University, we do create a lot of TSO ID's and therefore aliases. We have a pretty simple ISPF / Rexx panel that randomly assigns a user catalog (from a pool of 4 or 5) for a new alias and then creates that alias in all master catalogs. It's pretty simple to just replicate the DEFINE ALIAS for additional catalogs if they are added. The same panels have a delete alias for cleanup also.
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