How does someone other than a system admin see a Queue's Voicemail Message list (app or on line)?

Also, and I learned this by Trial and Error, apparently if someone is a Queue Manager, then she/he can logon to RC online Admin (Not Glip). As a Queue Manager, she/he will have an additional choice in the dropdown (My Extension/Queue Management/Admin)-choose Queue Management and they get all management functions. There is a Member Only access level-I am trying to determine what that is, but my guess is that this is a toggle on/off-a given user can have full Queue Management or is just a user-no such access.