Question: call_external find files and library

When call_external is a part of a procedure, how does one retrive the code pertaining to the external function being called, and how does maple know what call_external refers to, I thought maybe the packages that have been loaded contain these instructions, how can I retrive the relevant code for a given procedure that contains call_external when 'showstat' is used to inspect a command's maple code?

 

The help page for call_external redirects me to define_external, which is really what I expected to need calling before call_external can take on it's necessary meaning.

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