[TxMt] How can I find where a snippet/macro/command is defined?

[Morgan Packard]

Hello,
Currently, apple-left takes me to the end of the line. I'd like to change it
so apple-comma takes me there. That way I don't have to search for the arrow
keys. How can I find where this is defined? Generally, when I want to change
a key command, how can I track it down without searching manually through
every bundle?
thanks,
-Morgan
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