You can set the maximum number of users that are allowed to enter the chat. This example limits users to the number of 3.
Limit users
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Shortcode:
[wise-chat channel="userslimit" theme="colddark" show_user_name="1" allow_post_links="1" allow_post_images="1" enable_images_uploader="1" enable_twitter_hashtags="1" show_message_submit_button="1" allow_change_user_name="1" emoticons_enabled="1" window_title="Limit users" enable_youtube="1" allow_change_text_color="1" show_users_counter="1" channel_users_limit="3"]