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From: Marcus Harnisch <mh-gmane@online.de>
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Subject: Re: How can I (programmatically) tell if exwm is active?
Date: Wed, 16 Aug 2023 14:37:15 +0200
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On 16/08/2023 12.27, Eric S Fraga wrote:
 > As the subject line says, how can I check to see if exwm is active so I
 > can adapt my Emacs configuration accordingly?

Check out the following environment variables:

DESKTOP_SESSION, XDG_SESSION_DESKTOP, GDMSESSION

potentially others.