UBB.threads PHP Forum Software Community Forums Resources and Customizing Admin Zone Group Membership

Hi
I have a board for sell/wanted it is set so that Group membership "User" cannot post on that board.
In order to post there you need a upgraded membership.
There is one guy who is not upgraded he post his for sale items on other boards where he don't need to be upgraded to post.

Control Panel > Members > Edit Profile > Permissions
My question is: His Group Membership is "User"
What happens if I disable so that he does not belong to any Group?

In my mind I hope that he is treated as "Guest" when login and in that case he would not be able to post anything.
Is that a correct conclusion?

I did not want to test until I have answer to this question.
Thanks

The user will need to belong to a group or they should be unable to post or even see topics, forums, private messages, etc