Possibly, or from an individual message received via email, or, in response to a request from a member one of our "mentors" might run a search and provide the message number.
Or, in a more recent email a member tells a correspondent that the procedure is described in message number NNNNNNN.
The correspondent, not one to "do the internet" can then "call" for that particular email to be sent to them.
Think of it as a remote access request for specific information.
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Bob Bellizzi

Founder, Fuchs Friends ®
Founder & Executive Director, The Corneal Dystrophy Foundation