Hi evyse,
CMM actually stands for Custom Mission Managers. There are to my knowledge no other abbreviations used on the forum. Some CMMs are Moderators also, but that term is self explanatory. Moderators are "Global" or specifically for one language forum. When a mission builder uploads a mission it becomes available for the CMMs to test and if found to be a good one it is then accepted by them, if a dud, it is rejected and provided the builder is a forum member who is active, a PM will be sent to say either "thank you" or to say why the mission has been rejected. BTW, PM stands for "Personal Message". The PM facility is available to all by clicking on the icon beside a members name which allows you to see that persons profile, you can then scroll down to where it says "Send this member a personal message".
Regards,
Traddles.
P.S. Here is a sort of "who is who" for you.
http://80.95.161.114/shipsim/forum/index.php/topic,23.0.html
http://80.95.161.114/shipsim/forum/index.php/topic,4442.msg45286.html#msg45286