How can I be sure that my moderators DO NOT have access to the Admin CP?  I know there used to be a selector for that, to allow or disallow them the access.  I can't seem to find it anywhere.  Or is it built into the group itself?  Can only those in the Administrator group access the Admin CP?

Only admins, and you can set a second password, also change your admin pad. 

Thank you R-023.  How would I go about setting a second password?

Go to: acp>>system>>security.

After setting everything up, don't forget to update your new access information in the ips client area.

Thanks a lot for the information R-023.  I appreciate it.

No problem mate! 

Check also the other system security advice in that area. 

also @StevenT_505811 acp ---> Members ----> administrators also shows you who has administrator access as an user or group and you also have the logs and to check the moderators  acp ---> Members ----> moderators  and its same as administrator