It is trivial to export Wordpress users. What I need is the ability to identify Wordpress users who have not posted in wpForo. The posts count is not in a core Wordpress table. Is it possible to obtain the query that produces the wpForo members list? 

[domain]/wp-admin/admin.php?page=wpforo-members

I have tried it, and it works, but without any guarantee.

SELECT
  u.ID,
  u.user_login,
  u.user_email,
  u.user_registered,
  u.user_status,
  u.display_name,
  p.title,
  p.groupid,
  p.secondary_groupids,
  p.avatar,
  p.cover,
  p.posts,
  p.topics,
  p.questions,
  p.answers,
  p.comments,
  p.reactions_in,
  p.reactions_out,
  p.points,
  p.custom_points,
  p.online_time,
  p.timezone,
  p.location,
  p.signature,
  p.about,
  p.occupation,
  p.status          AS wpforo_status,
  p.is_email_confirmed,
  p.is_mention_muted
FROM wp_users AS u
LEFT JOIN wp_wpforo_profiles AS p
       ON p.userid = u.ID;

1. Change the prefix of the tables !! wp_ in ??_

2. After running it, click on “Export” at the bottom

3. Select CSV for Excel

4. OK