trigger on sysobjects

the system allows creation of triggers on sysobjects table. this works fine when one does changes to the sysobjects table after setting 'allow updates' option on. however, the trigger does not fire, when let's say you compile a procedure, which also goes through dropping and recreating a procedure. i am wondering about the difference in two scenarios.
sajalkAsked:
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bretCommented:
The difference, I think, would be that triggers are designed to fire on certain commands:  insert, update, and delete.  Drop procedures and create procedure are not one of those commands,
so the trigger doesn't fire.

Actually, I'm a bit surprised that they fire at all for system tables, as in the 4.2 version triggers could be created on system tables but would never fire (and this was documented).
But it sounds like Microsoft has enhanced them somewhat.
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Microsoft SQL Server

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