A pretty short question - how is the message handling method named (the first method that is called on message passing), and in which class it is defined?
Smalltalk / Squeak message handling method
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Sending a message to an object is handled by the VM, you won't find the specific method that handles it.
However,
ContextPart>>#send:to:with:super:contains an implementation that should be identical to how the VM is implemented. In particular, it callsBehavior>>#lookupSelector:, where you can see the code that climbs up the inheritance hierarchy.