[fpc-pascal] is there a way to list out all classes defined in a unit during run time?

[Dennis Poon]

I have a unit which I will incrementally add new subclasses of TCommand.

At run time, I want to get a list of subclasses of TCommand so that I 
can compare the where the user's required input (from network) matches 
the name of any TCommand.

Currently, I have to register each subclass in the initialization 
section of the unit.
Is there a way to list out all classes defined in a unit during run time?

Dennis
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